transition to ck5 compatibility

4 days ago · 14b8c5f6e3
60 changed files with 4179 additions and 0 deletions
--- a/Changelog.txt
+++ b/Changelog.txt
@ -0,0 +1,85 @@
+2010-03-xx Footnotes 7.x-2.5
+
+ - First Drupal 7 release. No major feature changes over 6.x-2.5.
+
+2010-12-31 Footnotes 2.5
+
+Major features
+
+ - Add new addon module: Footnotes with Views by AlexisWilke. [#939738]
+
+Smaller fixes
+
+ - Remove "DEPRECATED" text from Better URL filter and instead have a small 
+   "Note" about it not being available in Footnotes 7.x-x.x. [#1002436]
+ - Correctly ignore also a tag containing linebreak between the &gt; and &lt;. 
+   Fixes bug [#1002434]
+ - Add textarea to ignored tags. Anything inside a textarea will be ignored.
+   Bug [#974760]
+
+The intention is to branch a Drupal 7 version out of this release.
+
+2010-10-03 Footnotes 2.4
+
+Major features
+
+ - Add Footnotes Wysiwyg module with TinyMCE AND CKEditor support.
+   This deprecates Footnotes TinyMCE module, which is kept around for backward
+   compatibility.
+   [#728642]
+ - Add i18n support via Drupal.t() also to TinyMCE module. [#672034]
+ - New feature (option): Collapse identical footnotes into one, as if using same 
+   value="". [#808214]
+ - Implement [#728658] Highlight footnote when clicking the link. Add mention in 
+   README.txt how to change the highlight color if needed (Footnotes cannot know 
+   what is an appropriate color, I picked #eeeeee as the safest choice).
+
+Smaller fixes
+
+ - Bug [#761390]
+   Two small improper CSS names
+   ...was fixed by changing underscores to dashes in css selectors/classes.
+ - Deprecate Better URL filter as it is committed to Drupal 7 now. [#296208]
+ - Bug [#761664] 
+   Footnotes are double numbered when CSS is not used, such as in RSS feeds. 
+   (Due to using OL list)
+   ...was fixed by migrating to UL list. This is also appropriate since after
+   introduction of the value="" parameter the footnotes needn't comprise an
+   ordered list.
+
+
+2010-02-25 Footnotes 2.3
+
+ - Reset $used_values in _footnotes_replace_callback() after use. [#723446]
+
+2010-01-17 Footnotes 2.2
+
+ - Add TinyMCE support as a separate plugin tinymce_footnotes 
+   (thanks elgreg #464066)
+ - Can have multiple references to same footnote in body by repeating value=""
+   (#636808)
+Small fixes
+ - Move translations from "po" to "translations" subdirectory. #430656
+ - Rename footnotes-alternative_layout.css due to typo in filename.
+ - fix css: Use "ol.footnotes li" instead of "ol.footnotes" as selector for 
+   "list-style-type: none." Makes it stronger.
+ - fix html: columns="" should be cols="" bug: #687244
+
+2008-09-07 Footnotes 2.1
+
+ - Add "clear: both" to css of footnotes section. http://drupal.org/node/303828
+
+2008-07-30 Footnotes 2.0
+
+ - Add support for using [fn]square brackets[/fn] (268026)
+ - Change documentation to talk about [fn] by default, but <fn> is still
+   supported
+ - Add support for specifying "value" attribute. (emfabric 282104)
+ - Mention http://drupal.org/node/279420 in known issues
+ - Adding Better URL filter (fork from core). http://drupal.org/node/161217
+ - There appears to also be a French translation now. Thanks Beginner! 
+   (Japanese already done earlier.)
+ - Fix bug where teaser might cut into the middle of a footnote:
+   http://drupal.org/node/253326
+ - Start using the Drupal theme system, footnotes can now be themed by site
+   admins (emfabric 221156)
--- a/674
+++ b/674
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+
+  A patent license is "discriminatory" if it does not include within
+the scope of its coverage, prohibits the exercise of, or is
+conditioned on the non-exercise of one or more of the rights that are
+specifically granted under this License.  You may not convey a covered
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+to the third party based on the extent of your activity of conveying
+the work, and under which the third party grants, to any of the
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+conveyed by you (or copies made from those copies), or (b) primarily
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+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot convey a
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+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
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+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
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+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<http://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.
--- a/MERGE_NOTES.md
+++ b/MERGE_NOTES.md
@ -0,0 +1,19 @@
+# Merged BibCite Footnotes module
+
+This package merges the original `bibcite_footnotes` module and the CKEditor 5-only `bibcite_footnotes_2` module back into a single Drupal module named `bibcite_footnotes`.
+
+## What changed
+
+- Kept the original `bibcite_footnotes` machine name.
+- Removed the hard dependency on `fakeobjects` from the main `.info.yml` so the module can be used on CKEditor 5 / Drupal 10+ sites.
+- Added `bibcite_footnotes.ckeditor5.yml` for CKEditor 5 toolbar integration.
+- Added the CKEditor 5 `footnote_picker` library and supporting CSS/JS from `bibcite_footnotes_2`.
+- Repointed CKEditor 5 library references from `bibcite_footnotes_2/...` to `bibcite_footnotes/...`.
+- Removed the duplicate/stale CKEditor 5 PHP plugin class and old raw `js/ckeditor5` plugin files to avoid competing CKEditor 5 plugin definitions.
+- Kept the CKEditor 4 plugin files/classes for older Drupal 9 / CKEditor 4 use.
+
+## Notes
+
+The optional `bibcite_footnotes_article_with_citations` submodule is still a CKEditor 4 example configuration because its installed editor config uses `editor: ckeditor` and the `reference_footnotes` CKEditor 4 toolbar button.
+
+On a CKEditor 5 site, enable the main module and add the `Footnote/Citation` button to the desired text format's CKEditor 5 toolbar. Make sure the text format allows the custom `<fn value page reference>` element and the `filter_reference_footnotes` filter is enabled.
--- a/README.md
+++ b/README.md
@ -0,0 +1,100 @@
+Bibcite Footnotes
+=================
+
+Contents
+--------
+
+ * Introduction
+ * Installation
+ * Use
+ * Current Maintainers
+
+Introduction
+------------
+
+Provides a CKEditor plugin that lets a user select from a list of citations which
+appear in a formatted list at the bottom of the text that contains endnotes
+and references.
+
+Installation
+------------
+
+### Works Cited field
+
+1. Go to Administration > Structure > Content Types and edit the type that will include Reference Footnotes
+2. In the Manage Fields tab, press Add Field.
+3. In "Re-use an existing field" select "Entity reference: field_bibcite_fn_works_cited".
+4. Enter an appropriate label and press 'Save and continue'.
+5. On the next page select all the items in "Reference type" that should be available to choose from as footnotes.
+6. Customize the field under "Manage form display" and "Manage display", typically you'll want to 
+   place the Works Cited field directly under the Body field. See below for configuring with 
+   Inline Entity Form.
+7. In "Manage display", select "Rendered entity" in the Format drop-down for the Works Cited field.
+8. Press the Settings icon and under "View mode" choose "Citation" - a new view mode created 
+   by this module.
+
+#### Inline Enity Form
+
+It's recommended to also install [Inline Entity Form][1] which allowes a user to
+create new references directly in the node edit form.
+
+1. In "Entity Form Display", select ''Inline Entity Form - complex".
+2. Press the settings button in the rightmost column.
+3. Enabling  "Allow users to add new reference entities" and
+   "Allow users to add existing reference entities" is recommended. 
+
+[1]: https://www.drupal.org/project/inline_entity_form
+
+### CKEditor filter and toolbar button
+
+1. Enable the module.
+2. Go to Administration > Configuration > Content authoring > Text formats and editors.
+ 3. Edit the text format you want to add Reference Footnotes to
+4. Enable the Reference Footnotes Filter
+5. Drag the Reference Footnotes button into the active buttons toolbar.
+6. Configure the options for the Reference Footnotes Filter.
+
+If the 'Allowed HTML tags' filter is enabled add these HTML tags to the allowed list:
+
+```html
+    <a class href id> <div class id> <span class id> <ol class id type> 
+	<sup> <li class id>
+```
+
+Use
+---
+
+See the documentation for [Bibliography and Citation - Import][2] module for how to
+add citations exported from a citation management system like RefWorks or EndNote.
+
+[2]: https://www.drupal.org/project/bibcite
+
+### Adding a Works Cited item
+
+If Inline Entity Form is enabled, an author can create new citations or add references to 
+previously-imported or created references directly with the 'Add new reference' and 
+'Add existing reference' buttons.
+
+With Inline Entity Form, newly-added citations are immediately selectable in the 
+Reference Footnotes dialog.
+
+If not using the inline entity form, you can select previously imported or created references 
+
+When you edit the node again, and you click on the Reference Footnote editor toolbar button,
+a list of citations will be available to choose from.
+
+### Citation Formatting
+
+The Works Cited field will use the Default style selected in the 
+Bibliography & Citation administration pages at Administration > Configuration > 
+Bibliography & Citation > Settings in the Processing tab under Processor.'
+
+Current Maintainers
+-------------------
+
+ * Alexander O'Neill (https://www.drupal.org/u/alxp)
+
+Sponsors
+--------
+
+ * This work is supported by the [University of Prince Edward Island Robertson Library](https://library.upei.ca).
--- a/README.txt
+++ b/README.txt
@ -0,0 +1,57 @@
+INTRODUCTION
+------------------
+
+The Footnotes module is used to easily create automatically numbered footnote references in an article or post (such as a reference to a URL).
+
+ * For a full description of the module, visit the project page:
+   https://www.drupal.org/project/footnotes
+
+ * To submit bug reports and feature suggestions, or track changes:
+   https://www.drupal.org/project/issues/footnotes
+
+REQUIREMENTS
+------------------
+
+The Footnote module for Drupal 8 requires the following modules and plugins:
+
+ * FakeObjects (https://www.drupal.org/project/fakeobjects)
+ * CKEditor plugin (http://ckeditor.com/addon/fakeobjects)
+
+INSTALLATION
+----------------
+* Before you can use the FakeObjects module, you need to download the plugin from http://ckeditor.com/addon/fakeobjects and place it in /libraries/fakeobjects.
+
+* In all other steps, install the module as you would normally install a contributed Drupal module. Visit
+https://www.drupal.org/docs/8/extending-drupal-8/installing-drupal-8-modules for further information.
+
+CONFIGURATION
+-------------------
+* To use the footnotes filter in some input formats, go to Configuration ->
+   Text formats.
+
+* For the Text formats you want to support footnotes markup, select configure and activate a suitable footnotes filter.
+
+* In the place where you want to add a footnote enclose the footnote text within an fn tag:<code>[fn]like this[/fn]</code>. By default, footnotes are placed at the end of the text. You can also use a <code>[footnotes]</code> or <code>[footnotes /]</code> tag to position it anywhere you want.
+
+* The filter will take the text within the tag and move it to a footnote at the
+bottom of the page. In it's place it will place a number which is also a link to
+the footnote. Footnotes supports both <code>[fn]square brackets[/fn]</code> and <code><fn>angle brackets</fn></code>.
+
+* You can also use a "value" attribute to a) set the numbering to start from the given value, or b) to set an arbitrary text string as label.
+
+Ex:
+
+ [fn value="5"]This becomes footnote #5. Subsequent are #6, #7...[/fn]
+ [fn value="*"]This footnote is assigned the label "*"[/fn]
+ 
+Using value="" you can have multiple references to the same footnote in the text body.
+
+ [fn value="5"]This becomes footnote #5.[/fn]
+ [fn value="5"]This is a reference to the same footnote #5, this text itself is discarded.[/fn]
+
+TROUBLESHOOTING & FAQ
+------------------------------
+
+Q: When trying to install the Footnotes module, I get the message: Before you can use the FakeObjects module, you need to download the plugin from ckeditor.com and place it in /libraries/fakeobjects."
+
+A: To avoid this error message, please follow the guidelines in the Required modules and the Installation sections of this Readme file. Please mind that the Drupal 8.x-2.x branch of the Footnotes module only supports the CKEditor and does not support the TinyMCE.
--- a/assets/css/footnotes-alternative_layout.css
+++ b/assets/css/footnotes-alternative_layout.css
@ -0,0 +1,75 @@
+/*
+ * CSS specific to Footnotes module.
+ *
+ * This is an alternative layout, it is not so nice but overcomes
+ * the layout bugs on IE. http://drupal.org/node/166628
+ * To use this layout, just rename this file to footnotes.css.
+ */
+
+/* Add empty space before footnotes and a black line on top. */
+.footnotes {
+  clear: both;
+  margin-top: 4em;
+  margin-bottom: 2em;
+  border-top: 1px solid #000;
+}
+/* Make footnotes appear in a smaller font */
+.footnotes {
+  font-size: 0.9em;
+}
+/*
+  Make the footnote a supertext^1
+*/
+.see-footnote {
+  vertical-align: top;
+  position: relative;
+  top: -0.25em;
+  font-size: 0.9em;
+}
+/* Hide the bullet of the UL list of footnotes */
+
+ul.footnotes {
+  list-style-type: none;
+  margin-left: 0;
+  padding-left: 0;
+}
+ul.footnotes li {
+  margin-left: 0.5em;
+  list-style-type: none;
+  background: none; /* Garland theme sets a bullet via background image, this must be unset! See bug 861634 */
+}
+.footnotes .footnote-label {
+  vertical-align: top;
+  position: relative;
+  top: -0.35em;
+  left: -0.35em;
+  font-size: 0.8em;
+}
+/* Highlight the target footnote (or ref number, if a backlink was used) when user clicks a footnote. */
+.see-footnote:target,
+.footnotes .footnote:target {
+  background-color: #eee;
+}
+.see-footnote:target {
+  border: solid 1px #aaa;
+}
+/*
+  Make the multiple backlinks a supertext^1
+*/
+.footnotes .footnote-multi {
+  vertical-align: top;
+  position: relative;
+  top: -0.25em;
+  font-size: 0.75em;
+}
+/*
+ * Textile Footnotes
+ */
+/* First footnote */
+#fn1 {
+  border-top: 1px solid #000;
+  margin-top: 3em;
+}
+.footnote {
+  font-size: 0.9em;
+}
--- a/assets/css/footnotes.css
+++ b/assets/css/footnotes.css
@ -0,0 +1,82 @@
+/*
+ * CSS specific to Footnotes module.
+*
+* Thanks to binford2k@lug.wsu.edu for this tip and drinkypoo
+* for the question leading up to it. http://drupal.org/node/80538
+*/
+
+/* Add empty space before footnotes and a black line on top. */
+.footnotes {
+  clear: both;
+  margin-top: 4em;
+  margin-bottom: 2em;
+  border-top: 1px solid #000;
+}
+/* Make footnotes appear in a smaller font */
+.footnotes {
+  font-size: 0.9em;
+}
+/*
+  Make the footnote a supertext^1
+*/
+.see-footnote {
+  vertical-align: top;
+  position: relative;
+  top: -0.25em;
+  font-size: 0.9em;
+}
+/* Hide the bullet of the UL list of footnotes */
+
+ul.footnotes {
+  list-style-type: none;
+  margin-left: 0;
+  padding-left: 0;
+}
+ul.footnotes li {
+  margin-left: 2.5em;
+  list-style-type: none;
+  background: none; /* Garland theme sets a bullet via background image, this must be unset! See bug 861634 */
+}
+/* Move the footnote number outside of the margin for footnote text (hanging indent) */
+ul.footnotes {
+  /* This is apparently very needed for the "position: absolute;" below to work correctly */
+  position: relative;
+}
+.footnotes .footnote-label {
+  position: absolute;
+  left: 0;
+  z-index: 2;
+}
+/* Highlight the target footnote (or ref number, if a backlink was used) when user clicks a footnote. */
+.see-footnote:target,
+.footnotes .footnote:target {
+  background-color: #eee;
+}
+.see-footnote:target {
+  border: solid 1px #aaa;
+}
+/* Note: This CSS has a minor bug on all versions of IE in that the footnote numbers
+are aligned with the absolute bottom of their space, thus being a couple of pixels
+lower than their corresponding line of text. IE5.5 has a serious bug in that the numbers
+are not shifted left at all, thus being garbled together with the start of their text. */
+
+/*
+  Make the multiple backlinks a supertext^1
+*/
+.footnotes .footnote-multi {
+  vertical-align: top;
+  position: relative;
+  top: -0.25em;
+  font-size: 0.75em;
+}
+/*
+ * Textile Footnotes
+ */
+/* First footnote */
+#fn1 {
+  border-top: 1px solid #000;
+  margin-top: 3em;
+}
+.footnote {
+  font-size: 0.9em;
+}
--- a/assets/js/ckeditor/dialogs/footnotes.js
+++ b/assets/js/ckeditor/dialogs/footnotes.js
@ -0,0 +1,60 @@
+/**
+ * @file
+ */
+
+function footnotesDialog(editor, isEdit) {
+  return {
+    title: Drupal.t("Footnotes Dialog"),
+    minWidth: 500,
+    minHeight: 50,
+    contents: [
+      {
+        id: "info",
+        label: Drupal.t("Add a footnote"),
+        title: Drupal.t("Add a footnote"),
+        elements: [
+          {
+            id: "footnote",
+            type: "text",
+            label: Drupal.t("Footnote text :"),
+            setup(element) {
+              if (isEdit) {
+                this.setValue(element.getHtml());
+              }
+            }
+          },
+          {
+            id: "value",
+            type: "text",
+            label: Drupal.t("Value :"),
+            setup(element) {
+              if (isEdit) {
+                this.setValue(element.getAttribute("value"));
+              }
+            }
+          }
+        ]
+      }
+    ],
+    onShow() {
+      if (isEdit) {
+        this.fakeObj = CKEDITOR.plugins.footnotes.getSelectedFootnote(editor);
+        this.realObj = editor.restoreRealElement(this.fakeObj);
+      }
+      this.setupContent(this.realObj);
+    },
+    onOk() {
+      CKEDITOR.plugins.footnotes.createFootnote(
+        editor,
+        this.realObj,
+        this.getValueOf("info", "footnote"),
+        this.getValueOf("info", "value")
+      );
+      delete this.fakeObj;
+      delete this.realObj;
+    }
+  };
+}
+
+CKEDITOR.dialog.add("createfootnotes", editor => footnotesDialog(editor));
+CKEDITOR.dialog.add("editfootnotes", editor => footnotesDialog(editor, 1));
--- a/assets/js/ckeditor/icons/fn_icon2.png
+++ b/assets/js/ckeditor/icons/fn_icon2.png
--- a/assets/js/ckeditor/icons/footnotes.png
+++ b/assets/js/ckeditor/icons/footnotes.png
--- a/assets/js/ckeditor/plugin.js
+++ b/assets/js/ckeditor/plugin.js
@ -0,0 +1,151 @@
+/**
+ * @file
+ * A CKeditor plugin to insert footnotes as in-place <fn> elements (consumed by Footnotes module in Drupal).
+ *
+ * This is a rather sophisticated plugin to show a dialog to insert
+ * <fn> footnotes or edit existing ones. It produces and understands
+ * the <fn>angle bracket</fn> variant and uses the fakeObjects API to
+ * show a nice icon to the user, while producing proper <fn> tags when
+ * the text is saved or View Source is pressed.
+ *
+ * If a text contains footnotes of the [fn]square bracket[/fn] variant,
+ * they will be visible in the text and this plugin will not react to them.
+ *
+ * This plugin uses Drupal.t() to translate strings and will not as such
+ * work outside of Drupal. (But removing those functions would be the only
+ * change needed.) While being part of a Wysiwyg compatible module, it could
+ * also be used together with the CKEditor module.
+ *
+ * Drupal Wysiwyg requirement: The first argument to CKEDITOR.plugins.add()
+ * must be equal to the key used in $plugins[] in hook_wysiwyg_plugin().
+ */
+
+CKEDITOR.plugins.add("footnotes", {
+  requires: ["fakeobjects", "dialog"],
+  icons: "footnotes",
+  onLoad() {
+    const iconPath = `${window.location.origin + this.path}icons/fn_icon2.png`;
+    CKEDITOR.addCss(
+      `${".cke_footnote{background-image: url("}${CKEDITOR.getUrl(
+        iconPath
+      )});` +
+        `background - position: center center;` +
+        `background - repeat: no - repeat;` +
+        `width: 16px;` +
+        `height: 16px;` +
+        `}`
+    );
+  },
+  init(editor) {
+    editor.addCommand(
+      "createfootnotes",
+      new CKEDITOR.dialogCommand("createfootnotes", {
+        allowedContent: "fn[value]"
+      })
+    );
+    editor.addCommand(
+      "editfootnotes",
+      new CKEDITOR.dialogCommand("editfootnotes", {
+        allowedContent: "fn[value]"
+      })
+    );
+
+    // Drupal Wysiwyg requirement: The first argument to editor.ui.addButton()
+    // must be equal to the key used in $plugins[<pluginName>]['buttons'][<key>]
+    // in hook_wysiwyg_plugin().
+    if (editor.ui.addButton) {
+      editor.ui.addButton("footnotes", {
+        label: Drupal.t("Add a footnote"),
+        command: "createfootnotes",
+        icon: "footnotes"
+      });
+    }
+
+    if (editor.addMenuItems) {
+      editor.addMenuGroup("footnotes", 100);
+      editor.addMenuItems({
+        footnotes: {
+          label: Drupal.t("Edit footnote"),
+          command: "editfootnotes",
+          icon: "footnotes",
+          group: "footnotes"
+        }
+      });
+    }
+    if (editor.contextMenu) {
+      editor.contextMenu.addListener(element => {
+        if (!element || element.data("cke-real-element-type") !== "fn") {
+          return null;
+        }
+        return { footnotes: CKEDITOR.TRISTATE_ON };
+      });
+    }
+
+    editor.on("doubleclick", evt => {
+      if (CKEDITOR.plugins.footnotes.getSelectedFootnote(editor)) {
+        evt.data.dialog = "editfootnotes";
+      }
+    });
+
+    CKEDITOR.dialog.add("createfootnotes", `${this.path}dialogs/footnotes.js`);
+    CKEDITOR.dialog.add("editfootnotes", `${this.path}dialogs/footnotes.js`);
+  },
+  afterInit(editor) {
+    const { dataProcessor } = editor;
+    const { dataFilter } = dataProcessor;
+
+    if (dataFilter) {
+      dataFilter.addRules({
+        elements: {
+          fn(element) {
+            return editor.createFakeParserElement(
+              element,
+              "cke_footnote",
+              "hiddenfield",
+              false
+            );
+          }
+        }
+      });
+    }
+  }
+});
+
+CKEDITOR.plugins.footnotes = {
+  createFootnote(editor, origElement, text, value) {
+    let realElement;
+    if (!origElement) {
+      realElement = CKEDITOR.dom.element.createFromHtml("<fn></fn>");
+    } else {
+      realElement = origElement;
+    }
+
+    if (text && text.length > 0) {
+      realElement.setHtml(text);
+    }
+    if (value && value.length > 0) {
+      realElement.setAttribute("value", value);
+    }
+
+    const fakeElement = editor.createFakeElement(
+      realElement,
+      "cke_footnote",
+      "hiddenfield",
+      false
+    );
+    editor.insertElement(fakeElement);
+  },
+
+  getSelectedFootnote(editor) {
+    const selection = editor.getSelection();
+    const element = selection.getSelectedElement();
+    const seltype = selection.getType();
+
+    if (
+      seltype === CKEDITOR.SELECTION_ELEMENT &&
+      element.data("cke-real-element-type") === "hiddenfield"
+    ) {
+      return element;
+    }
+  }
+};
--- a/bibcite_footnotes.ckeditor5.yml
+++ b/bibcite_footnotes.ckeditor5.yml
@ -0,0 +1,14 @@
+bibcite_footnotes_footnote_picker:
+  ckeditor5:
+    plugins:
+      - footnotepicker2.FootnotePicker2
+  drupal:
+    label: 'Footnote/Citation'
+    library: bibcite_footnotes/footnote_picker
+    admin_library: bibcite_footnotes/footnote_picker
+    toolbar_items:
+      footnotePicker2:
+        label: 'Footnote'
+        icon: '<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 20 20" fill="currentColor"><path d="M6.5 4.5c-.6 0-1 .4-1 1v4.2c0 .6.4 1 1 1h.8v1.7H6.2c-.6 0-1 .4-1 1v.4h3.3c.6 0 1-.4 1-1V10c0-.5-.3-.9-.7-1.1.4-.3.7-.7.7-1.3V5.5c0-.6-.4-1-1-1H6.5z"/><path d="M11 6h7v1.4h-7V6zm0 3h7v1.4h-7V9zm0 3h5v1.4h-5V12z"/></svg>'
+    elements:
+      - <fn value page reference>
--- a/bibcite_footnotes.info.yml
+++ b/bibcite_footnotes.info.yml
@ -0,0 +1,10 @@
+name: 'BibCite Footnotes'
+type: module
+description: 'Inline footnote links for BibCite References with CKEditor 4 and CKEditor 5 support.'
+core_version_requirement: ^9.5 || ^10 || ^11
+package: 'Bibliography & Citation'
+dependencies:
+  - bibcite:bibcite
+  - bibcite:bibcite_entity
+  - drupal:editor
+  - drupal:filter
--- a/bibcite_footnotes.libraries.yml
+++ b/bibcite_footnotes.libraries.yml
@ -0,0 +1,29 @@
+reference_footnote:
+  version: VERSION
+  css:
+    theme:
+      css/reference_footnote.css: {}
+  dependencies:
+    - core/jquery
+    - core/drupalSettings
+
+replace_citations:
+  version: VERSION
+  js:
+    js/replace_citations.js: {}
+  dependencies:
+    - core/jquery
+    - core/drupalSettings
+
+footnote_picker:
+  css:
+    theme:
+      css/footnote_picker.admin.css: {}
+      css/footnote_picker.dialog.css: {}
+  js:
+    js/ckeditor5_plugins/footnotepicker2/build/footnotepicker2.js: {}
+  dependencies:
+    - core/ckeditor5
+    - core/drupal
+    - core/drupal.dialog
+    - core/jquery
--- a/bibcite_footnotes.module
+++ b/bibcite_footnotes.module
@ -0,0 +1,366 @@
+<?php
+
+/**
+ * @file
+ * Contains bibcite_footnotes.module.
+ */
+
+use Drupal\Core\Field\EntityReferenceFieldItemListInterface;
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Routing\RouteMatchInterface;
+use Drupal\Core\Url;
+use Drupal\Core\Link;
+use Drupal\bibcite_footnotes\CitationTools;
+use Drupal\bibcite_footnotes\Plugin\Filter\ReferenceFootnotesFilter;
+use Drupal\field\Entity\FieldConfig;
+
+/**
+ * Implements hook_theme().
+ */
+function bibcite_footnotes_theme() {
+  return [
+    'bibcite_footnote_link' => [
+      'render element' => 'fn',
+      'template' => 'bibcite-footnote-link',
+    ],
+    'bibcite_footnote_list' => [
+      'render element' => 'footnotes',
+      'path' => \Drupal::service('extension.list.module')->getPath('bibcite_footnotes') . '/templates',
+      'template' => 'bibcite-footnote-list',
+      'variables' => [
+        'notes' => [],
+        'note_type' => [],
+        'config' => [],
+      ],
+    ],
+  ];
+}
+
+/**
+ * Implements hook_help().
+ */
+function bibcite_footnotes_help($route_name, RouteMatchInterface $route_match) {
+  switch ($route_name) {
+    // Main module help for the bibcite_footnotes module.
+    case 'help.page.bibcite_footnotes':
+      $output = '';
+      $output .= '<h3>' . t('About') . '</h3>';
+      $output .= '<p>' . t('Inline footnote links for BibCite References') . '</p>';
+      return $output;
+
+    default:
+  }
+}
+
+/**
+ * Implementation of hook_preprocess_bibcite_footnote_list().
+ *
+ * Gatehrs all notes and prints out Notes and References as separate lists.
+ *
+ * @param $variables Theme variables.
+ *
+ * @throws \Drupal\Component\Plugin\Exception\InvalidPluginDefinitionException
+ * @throws \Drupal\Component\Plugin\Exception\PluginNotFoundException
+ */
+function bibcite_footnotes_preprocess_bibcite_footnote_list(&$variables) {
+  $config = $variables['config'];
+  $footnotes = $variables['notes'];
+
+  $notes = [
+    '#theme' => 'item_list',
+    '#list_type' => 'ul',
+    '#title' => $variables['note_type'] == $config['notes_section_label'],
+    '#attributes' => ['class' => 'footnotes'],
+    '#wrapper_attributes' => ['class' => 'container'],
+  ];
+
+  $notes['#attached']['library'][] = 'bibcite_footnotes/reference_footnote';
+  $dont_show_backlink_text = $config['reference_dont_show_backlink_text'];
+
+  $citation_tools = new CitationTools();
+  if (empty($footnotes)) {
+    return;
+  }
+  foreach ($footnotes as $fn) {
+    $item = [
+      '#id' => $fn['fn_id'],
+      '#wrapper_attributes' => [
+        'class' => ['footnote'],
+      ],
+    ];
+    $build = [];
+    $reference_entity_id = $fn['reference'];
+
+    $footnote_link_text = ($dont_show_backlink_text) ? '^' : $fn['value'];
+    if (!is_array($fn['ref_id'])) {
+      $url = Url::fromUserInput('#' . $fn['ref_id'], ['attributes' => ['id' => $fn['fn_id'], 'class' => 'footnote-link']]);
+      $link = Link::fromTextAndUrl(($footnote_link_text), $url)->toRenderable();
+      $build['footnote-link'] = $link;
+      $override_page_in_citation = $fn['page'] ? $fn['page'] : FALSE;
+    }
+    else {
+      // Output footnote that has more than one reference to it in the body.
+      // The only difference is to insert backlinks to all references.
+      // Helper: we need to enumerate a, b, c...
+      $abc = str_split("abcdefghijklmnopqrstuvwxyz");
+      $i = 0;
+
+      $url = Url::fromUserInput('#' . $fn['ref_id'][0], ['attributes' => ['id' => $fn['fn_id'], 'class' => 'footnote-link']]);
+      $build['footnote-link'] = Link::fromTextAndUrl($footnote_link_text, $url)->toRenderable();
+
+      foreach ($fn['ref_id'] as $ref) {
+        $url = Url::fromUserInput( '#' . $ref, ['attributes' => ['id' => $fn['fn_id'], 'class' => 'footnote-multi']]);
+        $build[] = Link::fromTextAndUrl($abc[$i], $url)->toRenderable();
+
+        $i++;
+      }
+      $override_page_in_citation = FALSE;
+    }
+
+    if (isset($fn['ibid']) && $fn['ibid']) {
+      $build['footnote-text'] = [
+        '#type' => 'markup',
+        '#markup' => ' <span class="endnote-text"><span class="ibid">'
+          . t('Ibid') . '.</span>'
+          . (!empty($fn['page']) ? ', ' . $fn['page'] : '')
+          . '</span>',
+      ];
+    }
+    else if (!empty($fn['text'])) {
+      $build['footnote-link'] = Link::fromTextAndUrl($footnote_link_text, $url)->toRenderable();
+      $build['footnote-text'] = [
+        '#type' => 'markup',
+        '#markup' => ' <span class="endnote-text">' . $fn['text'] . '</span>',
+      ];
+
+    }
+
+    if (!empty($reference_entity_id)) {
+      if (empty($fn['ibid'])) {
+        $citation_build = $citation_tools->getRenderableReference($reference_entity_id);
+        if ($override_page_in_citation) {
+          $citation_build['#data']['page'] = $override_page_in_citation;
+        }
+
+        $build[] = $citation_build;
+      }
+
+      //$render = render($build);
+      $citation_build_render = \Drupal::service('renderer')->render($citation_build);
+      $item['sort'] = trim(strip_tags($citation_build_render));
+    }
+
+//    $item['#markup'] = $render;
+    $notes['#items'][] = $build;
+    $reference_entity_id = FALSE;
+    $render = FALSE;
+  }
+
+  $variables['notes'] = $notes;
+}
+
+/**
+ * Comparator function for sorting lists of references.
+ *
+ * @param $a First item to compare
+ * @param $b Second item to compare
+ * @return int Result of the comparison.
+ */
+function _bibcite_footnotes_reference_array_cmp($a, $b) {
+  $a1 = (!empty($a['sort']) ? strtolower($a['sort']) : '');
+  $b1 = (!empty($b['sort']) ? strtolower($b['sort']) : '');
+  return strcmp($a1, $b1);
+}
+
+/**
+ * Implementation of hook_preprocess_bibcite_footnote_link().
+ *
+ * Construct a link inside a block of text so that it points to the reference list.
+ *
+ * @param $variables
+ */
+function bibcite_footnotes_preprocess_bibcite_footnote_link(&$variables) {
+//  $variables['fn']['fn']['#type'] = 'markeup';
+//  $variables['fn']['fn']['#markup'] = '<h2>Hello!</h2>';
+  $fn = $variables['fn']['fn'];
+  // TODO: Make a more formal way to denote inline citations.
+
+  $class = 'see-footnote';
+  // Generate the hover text
+  $citation_tools = new CitationTools();
+  $citation_entity_id = $fn['reference'];
+  $citation_data = $citation_tools->getRenderableReference($citation_entity_id);
+
+  // Citation contains a page reference, so construct parenthetical footnote.
+  // @TODO: Make it explicit.
+  if (!empty($fn['page'] && !is_numeric($fn['value']))) {
+    $fn['value'] = "({$fn['value']}, {$fn['page']})";
+    $citation_data['#data']['page'] = $fn['page'];
+    $class .= '-inline';
+  }
+  $citation_data_render = \Drupal::service('renderer')->render($citation_data);
+  $title = trim(strip_tags($citation_data_render));
+  $url = Url::fromUserInput('#' . $fn['fn_id'], ['attributes' => ['id' => $fn['ref_id'], 'class' => $class, 'title' => $title]]);
+
+
+  $link = Link::fromTextAndUrl($fn['value'], $url)->toRenderable();
+  unset($variables['fn']['fn']);
+  $variables['fn']['fn'] = $link;
+//  $variables['fn']['fn'][] = $link;
+}
+
+/**
+ * Implementation of hook_inline_entity_form_entity_form_alter().
+ *
+ * Force all entities to be saved once they are created.
+ *
+ * @TODO: Add cleanup batch task for orphaned References.
+ *
+ * @param $form
+ * @param \Drupal\Core\Form\FormStateInterface $form_state
+ */
+function bibcite_footnotes_inline_entity_form_entity_form_alter(&$form, FormStateInterface &$form_state) {
+  $form['#save_entity'] = TRUE;
+}
+
+/**
+ * Implementation of hook_form_node_form_alter().
+ *
+ * This function populates the Reference list drop-down in the CKEditor drop-down.
+ * It gathers all referenced entities of type bibcite_reference and puts them
+ * into a JavaScript setting under drupalSettings.bibcite_footnotes.references.
+ *
+ * @param $form
+ * @param \Drupal\Core\Form\FormStateInterface $form_state
+ */
+function bibcite_footnotes_form_node_form_alter(&$form, FormStateInterface &$form_state) {
+  $ief = $form_state->get('inline_entity_form');
+  if ($ief) {
+    // Inline entity storage uses hashes to separate out the field instances.
+    $bibcite_references = [];
+    foreach ($ief as $ief_instance) {
+      /**
+       * @var FieldConfig $field_config
+       */
+      if ($field_config = $ief_instance['instance']) {
+
+        // Check if this is a bibcite_reference field type.
+        if ($field_config->getSetting('handler') == 'default:bibcite_reference') {
+          $field_name = $field_config->get('field_name');
+          if (!empty($ief_instance['entities'])) {
+
+            foreach ($ief_instance['entities'] as $entity_wrapper) {
+              /**
+               * @var \Drupal\core\Entity\EntityInterface $entity
+               */
+              $entity = $entity_wrapper['entity'];
+              if ($entity->getEntityTypeId() == 'bibcite_reference') {
+                list($citation_text, $citation_key) = bibcite_footnotes_get_ckeditor_select_item($entity);
+                $bibcite_references[] = [$citation_text, $citation_key];
+              }
+            }
+          }
+        }
+      }
+    }
+
+    $triggering_element = $form_state->getTriggeringElement();
+    if (!$triggering_element) {
+      $form['#attached']['drupalSettings']['bibcite_footnotes']['references'] = $bibcite_references;
+    }
+    else {
+      $form[$triggering_element['#parents'][0]]['widget']['#attached']['library'][] = 'bibcite_footnotes/replace_citations';
+      $form[$triggering_element['#parents'][0]]['widget']['#attached']['drupalSettings']['bibcite_footnotes']['references'] = $bibcite_references;
+    }
+  }
+  else {
+    // Not using Inline Entity Form, get the references if they exist
+    $entity = $form_state->getFormObject()->getEntity();
+    $fields = $entity->getFields();
+    $reference_field = FALSE;
+    foreach ($fields as $field) {
+      $type = $field->getFieldDefinition();
+      if ($type->getType() == 'entity_reference') {
+        if ($type->getSetting('handler') == 'default:bibcite_reference') {
+          $referenced_entities = $field->referencedEntities();
+          $bibcite_references = [];
+          foreach ($referenced_entities as $referenced_entity) {
+            list($citation_text, $citation_key) = bibcite_footnotes_get_ckeditor_select_item($referenced_entity);
+            $bibcite_references[] = [$citation_text, $citation_key];
+          }
+          $form['#attached']['drupalSettings']['bibcite_footnotes']['references'] = $bibcite_references;
+        }
+      }
+    }
+  }
+}
+
+/**
+ * Construct an item to go into the CKEditor Reference drop-down list.
+ *
+ * @param $entity
+ *
+ * @return array
+ *   The form of the array is ["Citation string", [reference entity id].
+ */
+function bibcite_footnotes_get_ckeditor_select_item($entity): array {
+  $serializer = \Drupal::service('serializer');
+
+  $data = $serializer->normalize($entity, 'csl');
+  $build = ['#theme' => 'bibcite_citation', '#data' => $data];
+  $build_render = \Drupal::service('renderer')->render($build);
+  $citation_text = trim(strip_tags($build_render));
+  // Attempt to match up pre-saved entities with the eventual saved ones.
+  $citation_key = $entity->id->first()->getValue()['value'];
+  return [$citation_text, $citation_key];
+}
+
+/**
+ * Implementation of hook_preprocess_field().
+ * Sort the works cited list by rendered text, which results in author(s) then title.
+ *
+ * @param $variables
+ * @param $hook
+ */
+function bibcite_footnotes_preprocess_field(&$variables, $hook) {
+  $citation_tools = new CitationTools();
+  if ($variables['field_name'] == 'field_bibcite_fn_works_cited') {
+
+    foreach($variables['element'] as $index => $element) {
+      if (is_numeric($index)) {
+        $renderable = $citation_tools->getRenderableReference($element['#bibcite_reference']);
+        $renderable = \Drupal::service('renderer')->render($renderable);
+        $items[] = [
+          'orig_index' => $index,
+          'orig_element' => $element,
+          'rendered' => trim(strip_tags($renderable)),
+        ];
+      }
+    }
+    uasort($items, '_bibcite_footnotes_sort_rendered_references');
+    $i = 0;
+    foreach ($items as $item) {
+      $variables['element'][$i] = $item['orig_element'];
+      $variables['element']['#items'][$i] = $item['orig_element'];
+      $variables['items'][$i]['content'] = $item['orig_element'];
+      $i += 1;
+    }
+  }
+}
+
+/**
+ * Comparator function for theme field preprocess.
+ *
+ * @param $a
+ *   The first renderable element.
+ * @param $b
+ *   The second renderable element.
+ *
+ * @return int
+ */
+function _bibcite_footnotes_sort_rendered_references($a, $b) {
+  if ($a['rendered'] == $b['rendered']) {
+    return 0;
+  }
+  return strtolower($a['rendered']) < strtolower($b['rendered']) ? -1 : 1;
+}
--- a/bibcite_footnotes_article_with_citations/README.md
+++ b/bibcite_footnotes_article_with_citations/README.md
@ -0,0 +1,4 @@
+Description
+-----------
+
+Example content type and text format to demonstrate a fully-configured Reference Footnotes setup.
--- a/bibcite_footnotes_article_with_citations/bibcite_footnotes_article_with_citations.info.yml
+++ b/bibcite_footnotes_article_with_citations/bibcite_footnotes_article_with_citations.info.yml
@ -0,0 +1,13 @@
+name: 'BibCite Footnotes Article with Citations'
+type: module
+description: 'Example module to show a fully-configured content type and text format with Reference Footnotes.'
+core_version_requirement: ^9.5 || ^10 || ^11
+package: 'Bibliography & Citation'
+dependencies:
+  - bibcite_footnotes:bibcite_footnotes
+  - bibcite:bibcite_import
+  - bibcite:bibcite_bibtex
+  - bibcite:bibcite_endnote
+  - bibcite:bibcite_ris
+  - bibcite:bibcite_marc
+  - inline_entity_form:inline_entity_form
--- a/bibcite_footnotes_article_with_citations/config/install/core.entity_form_display.node.bibcite_fn_article_references.default.yml
+++ b/bibcite_footnotes_article_with_citations/config/install/core.entity_form_display.node.bibcite_fn_article_references.default.yml
@ -0,0 +1,113 @@
+langcode: en
+status: true
+dependencies:
+  config:
+    - field.field.node.bibcite_fn_article_references.body
+    - field.field.node.bibcite_fn_article_references.field_bibcite_fn_works_cited
+    - field.field.node.bibcite_fn_article_references.field_image
+    - field.field.node.bibcite_fn_article_references.field_tags
+    - image.style.thumbnail
+    - node.type.bibcite_fn_article_references
+  module:
+    - image
+    - inline_entity_form
+    - path
+    - text
+id: node.bibcite_fn_article_references.default
+targetEntityType: node
+bundle: bibcite_fn_article_references
+mode: default
+content:
+  body:
+    type: text_textarea_with_summary
+    weight: 7
+    settings:
+      rows: 9
+      summary_rows: 3
+      placeholder: ''
+    third_party_settings: {  }
+    region: content
+  created:
+    type: datetime_timestamp
+    weight: 2
+    region: content
+    settings: {  }
+    third_party_settings: {  }
+  field_bibcite_fn_works_cited:
+    weight: 8
+    settings:
+      form_mode: default
+      label_singular: ''
+      label_plural: ''
+      allow_new: true
+      allow_existing: true
+      match_operator: CONTAINS
+      override_labels: false
+      collapsible: false
+      collapsed: false
+      allow_duplicate: false
+    third_party_settings: {  }
+    type: inline_entity_form_complex
+    region: content
+  field_image:
+    weight: 10
+    settings:
+      progress_indicator: throbber
+      preview_image_style: thumbnail
+    third_party_settings: {  }
+    type: image_image
+    region: content
+  field_tags:
+    weight: 9
+    settings:
+      match_operator: CONTAINS
+      size: 60
+      placeholder: ''
+    third_party_settings: {  }
+    type: entity_reference_autocomplete
+    region: content
+  path:
+    type: path
+    weight: 5
+    region: content
+    settings: {  }
+    third_party_settings: {  }
+  promote:
+    type: boolean_checkbox
+    settings:
+      display_label: true
+    weight: 3
+    region: content
+    third_party_settings: {  }
+  status:
+    type: boolean_checkbox
+    settings:
+      display_label: true
+    weight: 6
+    region: content
+    third_party_settings: {  }
+  sticky:
+    type: boolean_checkbox
+    settings:
+      display_label: true
+    weight: 4
+    region: content
+    third_party_settings: {  }
+  title:
+    type: string_textfield
+    weight: 0
+    region: content
+    settings:
+      size: 60
+      placeholder: ''
+    third_party_settings: {  }
+  uid:
+    type: entity_reference_autocomplete
+    weight: 1
+    settings:
+      match_operator: CONTAINS
+      size: 60
+      placeholder: ''
+    region: content
+    third_party_settings: {  }
+hidden: {  }
--- a/bibcite_footnotes_article_with_citations/config/install/core.entity_view_display.node.bibcite_fn_article_references.default.yml
+++ b/bibcite_footnotes_article_with_citations/config/install/core.entity_view_display.node.bibcite_fn_article_references.default.yml
@ -0,0 +1,57 @@
+langcode: en
+status: true
+dependencies:
+  config:
+    - field.field.node.bibcite_fn_article_references.body
+    - field.field.node.bibcite_fn_article_references.field_bibcite_fn_works_cited
+    - field.field.node.bibcite_fn_article_references.field_image
+    - field.field.node.bibcite_fn_article_references.field_tags
+    - node.type.bibcite_fn_article_references
+  module:
+    - image
+    - text
+    - user
+id: node.bibcite_fn_article_references.default
+targetEntityType: node
+bundle: bibcite_fn_article_references
+mode: default
+content:
+  body:
+    label: hidden
+    type: text_default
+    weight: 1
+    settings: {  }
+    third_party_settings: {  }
+    region: content
+  field_bibcite_fn_works_cited:
+    weight: 2
+    label: above
+    settings:
+      view_mode: citation
+      link: false
+    third_party_settings: {  }
+    type: entity_reference_entity_view
+    region: content
+  field_image:
+    weight: 4
+    label: above
+    settings:
+      image_style: ''
+      image_link: ''
+    third_party_settings: {  }
+    type: image
+    region: content
+  field_tags:
+    weight: 3
+    label: above
+    settings:
+      link: true
+    third_party_settings: {  }
+    type: entity_reference_label
+    region: content
+  links:
+    weight: 0
+    region: content
+    settings: {  }
+    third_party_settings: {  }
+hidden: {  }
--- a/bibcite_footnotes_article_with_citations/config/install/editor.editor.basic_html_with_references.yml
+++ b/bibcite_footnotes_article_with_citations/config/install/editor.editor.basic_html_with_references.yml
@ -0,0 +1,51 @@
+langcode: en
+status: true
+dependencies:
+  config:
+    - filter.format.basic_html_with_references
+  module:
+    - ckeditor
+format: basic_html_with_references
+editor: ckeditor
+settings:
+  toolbar:
+    rows:
+      -
+        -
+          name: Formatting
+          items:
+            - Bold
+            - Italic
+        -
+          name: Links
+          items:
+            - DrupalLink
+            - DrupalUnlink
+        -
+          name: Lists
+          items:
+            - BulletedList
+            - NumberedList
+        -
+          name: Media
+          items:
+            - Blockquote
+            - DrupalImage
+        -
+          name: Tools
+          items:
+            - Source
+            - reference_footnotes
+  plugins:
+    stylescombo:
+      styles: ''
+    language:
+      language_list: un
+image_upload:
+  status: false
+  scheme: public
+  directory: inline-images
+  max_size: ''
+  max_dimensions:
+    width: null
+    height: null
--- a/bibcite_footnotes_article_with_citations/config/install/field.field.node.bibcite_fn_article_references.body.yml
+++ b/bibcite_footnotes_article_with_citations/config/install/field.field.node.bibcite_fn_article_references.body.yml
@ -0,0 +1,21 @@
+langcode: en
+status: true
+dependencies:
+  config:
+    - field.storage.node.body
+    - node.type.bibcite_fn_article_references
+  module:
+    - text
+id: node.bibcite_fn_article_references.body
+field_name: body
+entity_type: node
+bundle: bibcite_fn_article_references
+label: Body
+description: ''
+required: false
+translatable: true
+default_value: {  }
+default_value_callback: ''
+settings:
+  display_summary: true
+field_type: text_with_summary
--- a/bibcite_footnotes_article_with_citations/config/install/field.field.node.bibcite_fn_article_references.field_bibcite_fn_works_cited.yml
+++ b/bibcite_footnotes_article_with_citations/config/install/field.field.node.bibcite_fn_article_references.field_bibcite_fn_works_cited.yml
@ -0,0 +1,98 @@
+langcode: en
+status: true
+dependencies:
+  config:
+    - bibcite_entity.bibcite_reference_type.artwork
+    - bibcite_entity.bibcite_reference_type.audiovisual
+    - bibcite_entity.bibcite_reference_type.bill
+    - bibcite_entity.bibcite_reference_type.book
+    - bibcite_entity.bibcite_reference_type.book_chapter
+    - bibcite_entity.bibcite_reference_type.broadcast
+    - bibcite_entity.bibcite_reference_type.case
+    - bibcite_entity.bibcite_reference_type.chart
+    - bibcite_entity.bibcite_reference_type.classical
+    - bibcite_entity.bibcite_reference_type.conference_paper
+    - bibcite_entity.bibcite_reference_type.conference_proceedings
+    - bibcite_entity.bibcite_reference_type.database
+    - bibcite_entity.bibcite_reference_type.film
+    - bibcite_entity.bibcite_reference_type.government_report
+    - bibcite_entity.bibcite_reference_type.hearing
+    - bibcite_entity.bibcite_reference_type.journal
+    - bibcite_entity.bibcite_reference_type.journal_article
+    - bibcite_entity.bibcite_reference_type.legal_ruling
+    - bibcite_entity.bibcite_reference_type.magazine_article
+    - bibcite_entity.bibcite_reference_type.manuscript
+    - bibcite_entity.bibcite_reference_type.map
+    - bibcite_entity.bibcite_reference_type.miscellaneous
+    - bibcite_entity.bibcite_reference_type.miscellaneous_section
+    - bibcite_entity.bibcite_reference_type.newspaper_article
+    - bibcite_entity.bibcite_reference_type.patent
+    - bibcite_entity.bibcite_reference_type.personal
+    - bibcite_entity.bibcite_reference_type.presentation
+    - bibcite_entity.bibcite_reference_type.report
+    - bibcite_entity.bibcite_reference_type.software
+    - bibcite_entity.bibcite_reference_type.statute
+    - bibcite_entity.bibcite_reference_type.thesis
+    - bibcite_entity.bibcite_reference_type.unpublished
+    - bibcite_entity.bibcite_reference_type.web_article
+    - bibcite_entity.bibcite_reference_type.web_project_page
+    - bibcite_entity.bibcite_reference_type.web_service
+    - bibcite_entity.bibcite_reference_type.website
+    - field.storage.node.field_bibcite_fn_works_cited
+    - node.type.bibcite_fn_article_references
+id: node.bibcite_fn_article_references.field_bibcite_fn_works_cited
+field_name: field_bibcite_fn_works_cited
+entity_type: node
+bundle: bibcite_fn_article_references
+label: 'Works Cited'
+description: 'List of works mentioned in this article.'
+required: false
+translatable: true
+default_value: {  }
+default_value_callback: ''
+settings:
+  handler: 'default:bibcite_reference'
+  handler_settings:
+    target_bundles:
+      artwork: artwork
+      audiovisual: audiovisual
+      bill: bill
+      book: book
+      book_chapter: book_chapter
+      broadcast: broadcast
+      case: case
+      chart: chart
+      classical: classical
+      conference_paper: conference_paper
+      conference_proceedings: conference_proceedings
+      database: database
+      film: film
+      government_report: government_report
+      hearing: hearing
+      journal: journal
+      journal_article: journal_article
+      legal_ruling: legal_ruling
+      magazine_article: magazine_article
+      manuscript: manuscript
+      map: map
+      miscellaneous: miscellaneous
+      miscellaneous_section: miscellaneous_section
+      newspaper_article: newspaper_article
+      patent: patent
+      personal: personal
+      presentation: presentation
+      report: report
+      software: software
+      statute: statute
+      thesis: thesis
+      unpublished: unpublished
+      web_article: web_article
+      web_project_page: web_project_page
+      web_service: web_service
+      website: website
+    sort:
+      field: title
+      direction: ASC
+    auto_create: false
+    auto_create_bundle: artwork
+field_type: entity_reference
--- a/bibcite_footnotes_article_with_citations/config/install/field.field.node.bibcite_fn_article_references.field_image.yml
+++ b/bibcite_footnotes_article_with_citations/config/install/field.field.node.bibcite_fn_article_references.field_image.yml
@ -0,0 +1,37 @@
+langcode: en
+status: true
+dependencies:
+  config:
+    - field.storage.node.field_image
+    - node.type.bibcite_fn_article_references
+  module:
+    - image
+id: node.bibcite_fn_article_references.field_image
+field_name: field_image
+entity_type: node
+bundle: bibcite_fn_article_references
+label: Image
+description: ''
+required: false
+translatable: true
+default_value: {  }
+default_value_callback: ''
+settings:
+  file_directory: '[date:custom:Y]-[date:custom:m]'
+  file_extensions: 'png gif jpg jpeg'
+  max_filesize: ''
+  max_resolution: ''
+  min_resolution: ''
+  alt_field: true
+  alt_field_required: true
+  title_field: false
+  title_field_required: false
+  default_image:
+    uuid: ''
+    alt: ''
+    title: ''
+    width: null
+    height: null
+  handler: 'default:file'
+  handler_settings: {  }
+field_type: image
--- a/bibcite_footnotes_article_with_citations/config/install/field.field.node.bibcite_fn_article_references.field_tags.yml
+++ b/bibcite_footnotes_article_with_citations/config/install/field.field.node.bibcite_fn_article_references.field_tags.yml
@ -0,0 +1,28 @@
+langcode: en
+status: true
+dependencies:
+  config:
+    - field.storage.node.field_tags
+    - node.type.bibcite_fn_article_references
+    - taxonomy.vocabulary.tags
+id: node.bibcite_fn_article_references.field_tags
+field_name: field_tags
+entity_type: node
+bundle: bibcite_fn_article_references
+label: Tags
+description: 'Enter a comma-separated list. For example: Amsterdam, Mexico City, "Cleveland, Ohio"'
+required: false
+translatable: true
+default_value: {  }
+default_value_callback: ''
+settings:
+  handler: 'default:taxonomy_term'
+  handler_settings:
+    target_bundles:
+      tags: tags
+    sort:
+      field: name
+      direction: asc
+    auto_create: true
+    auto_create_bundle: ''
+field_type: entity_reference
--- a/bibcite_footnotes_article_with_citations/config/install/filter.format.basic_html_with_references.yml
+++ b/bibcite_footnotes_article_with_citations/config/install/filter.format.basic_html_with_references.yml
@ -0,0 +1,87 @@
+langcode: en
+status: true
+dependencies:
+  module:
+    - bibcite_footnotes
+    - editor
+    - footnotes
+name: 'Basic HTML with References'
+format: basic_html_with_references
+weight: 0
+filters:
+  filter_reference_footnotes:
+    id: filter_reference_footnotes
+    provider: bibcite_footnotes
+    status: true
+    weight: -50
+    settings:
+      footnotes_collapse: '1'
+      footnotes_ibid: '0'
+      notes_section_label: Notes
+      reference_dont_show_backlink_text: '0'
+      works_cited_sort_by: alphabetical
+  editor_file_reference:
+    id: editor_file_reference
+    provider: editor
+    status: true
+    weight: -45
+    settings: {  }
+  filter_html_image_secure:
+    id: filter_html_image_secure
+    provider: filter
+    status: true
+    weight: -46
+    settings: {  }
+  filter_url:
+    id: filter_url
+    provider: filter
+    status: false
+    weight: -41
+    settings:
+      filter_url_length: 72
+  filter_html:
+    id: filter_html
+    provider: filter
+    status: true
+    weight: -49
+    settings:
+      allowed_html: '<a href hreflang id class="" title> <div id class=""> <em> <strong> <cite> <blockquote cite> <code> <ul type class=""> <ol id type class=""> <li id class=""> <dl> <dt> <dd> <h2 id> <h3 id> <h4 id> <h5 id> <h6 id> <span id class=""> <sup> <img src alt data-entity-type data-entity-uuid data-align data-caption> <p> <fn id>'
+      filter_html_help: true
+      filter_html_nofollow: false
+  filter_autop:
+    id: filter_autop
+    provider: filter
+    status: false
+    weight: -42
+    settings: {  }
+  filter_align:
+    id: filter_align
+    provider: filter
+    status: true
+    weight: -48
+    settings: {  }
+  filter_caption:
+    id: filter_caption
+    provider: filter
+    status: true
+    weight: -47
+    settings: {  }
+  filter_htmlcorrector:
+    id: filter_htmlcorrector
+    provider: filter
+    status: false
+    weight: -40
+    settings: {  }
+  filter_html_escape:
+    id: filter_html_escape
+    provider: filter
+    status: false
+    weight: -43
+    settings: {  }
+  filter_footnotes:
+    id: filter_footnotes
+    provider: footnotes
+    status: false
+    weight: -44
+    settings:
+      footnotes_collapse: '0'
--- a/bibcite_footnotes_article_with_citations/config/install/node.type.bibcite_fn_article_references.yml
+++ b/bibcite_footnotes_article_with_citations/config/install/node.type.bibcite_fn_article_references.yml
@ -0,0 +1,17 @@
+langcode: en
+status: true
+dependencies:
+  module:
+    - menu_ui
+third_party_settings:
+  menu_ui:
+    available_menus:
+      - main
+    parent: 'main:'
+name: 'Article with References'
+type: bibcite_fn_article_references
+description: 'Article that includes a Works Cited field and in-text references.'
+help: ''
+new_revision: true
+preview_mode: 1
+display_submitted: true
--- a/composer.json
+++ b/composer.json
@ -0,0 +1,38 @@
+{
+  "name": "drupal/footnotes",
+  "description": "Add automatically numbered footnotes to your posts.",
+  "type": "drupal-module",
+  "homepage": "https://drupal.org/project/footnotes",
+  "authors": [
+    {
+      "name": "Andrii Aleksandrov (id.aleks)",
+      "homepage": "https://www.drupal.org/u/idaleks",
+      "role": "Maintainer"
+    },
+    {
+      "name": "Oleksandr Dekhteruk (pifagor)",
+      "homepage": "https://www.drupal.org/u/pifagor",
+      "role": "Maintainer"
+    },
+    {
+      "name": "Fernando Conceição (yukare)",
+      "homepage": "https://www.drupal.org/u/yukare",
+      "role": "Maintainer"
+    },
+    {
+      "name": "Henrik Ingo (hingo)",
+      "homepage": "https://www.drupal.org/u/hingo",
+      "role": "Maintainer"
+    }
+  ],
+  "support": {
+    "issues": "https://drupal.org/project/issues/footnotes",
+    "source": "https://cgit.drupalcode.org/footnotes"
+  },
+  "license": "GPL-2.0+",
+  "minimum-stability": "dev",
+  "require": {
+    "drupal/core": ">=8.6",
+    "drupal/fakeobjects": "^1.0"
+  }
+}
--- a/config/optional/field.storage.node.field_bibcite_fn_works_cited.yml
+++ b/config/optional/field.storage.node.field_bibcite_fn_works_cited.yml
@ -0,0 +1,24 @@
+langcode: en
+status: true
+dependencies:
+  module:
+    - bibcite_entity
+    - node
+third_party_settings:
+  field_permissions:
+    permission_type: public
+_core:
+  default_config_hash: pxSiuPskUjLuu_0TFIFVYFyZtkIelIPBysbXt_LyLVk
+id: node.field_bibcite_fn_works_cited
+field_name: field_bibcite_fn_works_cited
+entity_type: node
+type: entity_reference
+settings:
+  target_type: bibcite_reference
+module: core
+locked: false
+cardinality: -1
+translatable: true
+indexes: {  }
+persist_with_no_fields: false
+custom_storage: false
--- a/config/schema/bibcite_footnotes.schema.yml
+++ b/config/schema/bibcite_footnotes.schema.yml
@ -0,0 +1,19 @@
+filter_settings.filter_reference_footnotes:
+  type: mapping
+  label: 'Reference Footnotes filter settings'
+  mapping:
+    footnotes_collapse:
+      type: boolean
+      label: 'Collapse identical footnotes'
+    footnotes_ibid:
+      type: boolean
+      label: 'Use Ibid.'
+    notes_section_label:
+      type: label
+      label: 'Notes section heading label'
+    reference_dont_show_backlink_text:
+      type: boolean
+      label: "Don't show note value text in reference list"
+    works_cited_sort_by:
+      type: string
+      label: 'Sort works cited by'
--- a/css/reference_footnote.css
+++ b/css/reference_footnote.css
@ -0,0 +1,95 @@
+
+.footnote-list .footnotes .footnote-link,
+.footnote-list .footnotes .footnote-multi {
+  float: left;
+}
+.footnote-list .footnotes .footnote-link::after,
+.footnote-list .footnotes .footnote-multi::after {
+  content: " ";
+  white-space: pre;
+}
+
+/*
+ * CSS specific to Bibcite Footnotes module.
+ * (Borrowed from Footnotes module.
+ *
+*
+* Thanks to binford2k@lug.wsu.edu for this tip and drinkypoo
+* for the question leading up to it. http://drupal.org/node/80538
+*/
+
+/* Add empty space before footnotes and a black line on top. */
+.footnotes {
+  clear: both;
+  margin-top: 4em;
+  margin-bottom: 2em;
+  border-top: 1px solid #000;
+}
+/* Make footnotes appear in a smaller font */
+.footnotes {
+  font-size: 0.9em;
+}
+/*
+  Make the footnote a supertext^1
+*/
+.see-footnote {
+  vertical-align: top;
+  position: relative;
+  top: -0.25em;
+  font-size: 0.9em;
+}
+/* Hide the bullet of the UL list of footnotes */
+
+ul.footnotes {
+  list-style-type: none;
+  margin-left: 0;
+  padding-left: 0;
+}
+ul.footnotes li {
+  margin-left: 2.5em;
+  list-style-type: none;
+  background: none; /* Garland theme sets a bullet via background image, this must be unset! See bug 861634 */
+}
+/* Move the footnote number outside of the margin for footnote text (hanging indent) */
+ul.footnotes {
+  /* This is apparently very needed for the "position: absolute;" below to work correctly */
+  position: relative;
+}
+.footnotes .footnote-label {
+  position: absolute;
+  left: 0;
+  z-index: 2;
+}
+/* Highlight the target footnote (or ref number, if a backlink was used) when user clicks a footnote. */
+.see-footnote:target,
+.footnotes .footnote:target {
+  background-color: #eee;
+}
+.see-footnote:target {
+  border: solid 1px #aaa;
+}
+/* Note: This CSS has a minor bug on all versions of IE in that the footnote numbers
+are aligned with the absolute bottom of their space, thus being a couple of pixels
+lower than their corresponding line of text. IE5.5 has a serious bug in that the numbers
+are not shifted left at all, thus being garbled together with the start of their text. */
+
+/*
+  Make the multiple backlinks a supertext^1
+*/
+.footnotes .footnote-multi {
+  vertical-align: top;
+  position: relative;
+  top: -0.25em;
+  font-size: 0.75em;
+}
+/*
+ * Textile Footnotes
+ */
+/* First footnote */
+#fn1 {
+  border-top: 1px solid #000;
+  margin-top: 3em;
+}
+.footnote {
+  font-size: 0.9em;
+}
--- a/footnotes.info.yml
+++ b/footnotes.info.yml
@ -0,0 +1,10 @@
+name: Footnotes
+description: 'Add automatically numbered footnotes to your posts.'
+
+type: module
+core_version_requirement: ^8 || ^9
+
+dependencies:
+  - 'fakeobjects:fakeobjects'
+test_dependencies:
+  - 'fakeobjects:fakeobjects'
--- a/footnotes.install
+++ b/footnotes.install
@ -0,0 +1,45 @@
+<?php
+
+/**
+ * @file
+ * Install, update and uninstall functions for the Footnotes module.
+ */
+
+/**
+ * Implements hook_requirements().
+ */
+function footnotes_requirements($phase) {
+  if ($phase != 'runtime') {
+    return [];
+  }
+
+  // Check if fakeobjects module is enabled and properly configured.
+  $fakeobjects_exist = \Drupal::moduleHandler()->moduleExists('fakeobjects');
+  if ($fakeobjects_exist) {
+    $fakeobjects_requirements = fakeobjects_requirements($phase);
+    if ($fakeobjects_requirements['fakeobjects']['severity'] === REQUIREMENT_OK) {
+      $requirements['footnotes'] = [
+        'title' => t('Footnotes'),
+        'value' => t('Footnotes requirements are OK.'),
+        'severity' => REQUIREMENT_OK,
+      ];
+    }
+    else {
+      $requirements['footnotes'] = [
+        'title' => t('Footnotes'),
+        'value' => t('Footnotes requirements are not properly configured. Please check Fakeobjects module requirements.'),
+        'severity' => REQUIREMENT_ERROR,
+      ];
+    }
+  }
+  else {
+    $requirements['footnotes'] = [
+      'title' => t('Footnotes'),
+      'value' => t("<a href=':href'>Fakeobjects module</a> isn't installed/enabled.", [':href' => 'https://www.drupal.org/project/fakeobjects']),
+      'severity' => REQUIREMENT_ERROR,
+      'description' => t('Footnotes module has a dependency on Fakeobjects module. Ensure that Fakeobjects module is enabled and configured.'),
+    ];
+  }
+
+  return $requirements;
+}
--- a/footnotes.libraries.yml
+++ b/footnotes.libraries.yml
@ -0,0 +1,5 @@
+footnotes:
+  version: VERSION
+  css:
+    component:
+      assets/css/footnotes.css: {}
--- a/footnotes.module
+++ b/footnotes.module
@ -0,0 +1,92 @@
+<?php
+
+/**
+ * @file
+ * This file contains the hooks for Footnotes module.
+ *
+ * The Footnotes module is a filter that can be used to insert
+ * automatically numbered footnotes into Drupal texts.
+ */
+
+use Drupal\Core\Routing\RouteMatchInterface;
+use Drupal\Core\Url;
+
+/**
+ * Implements hook_help().
+ */
+function footnotes_help($route_name, RouteMatchInterface $route_match) {
+  switch ($route_name) {
+    case 'help.page.footnotes':
+      return t("Insert automatically numbered footnotes using &lt;fn&gt; or [fn] tags. Enable the footnotes text filter <a href=':href'>here</a>", [
+        ':href' => Url::fromRoute('filter.admin_overview')->toString(),
+      ]);
+  }
+}
+
+/**
+ * Implements hook_theme().
+ *
+ * Thanks to emfabric for this implementation. http://drupal.org/node/221156
+ */
+function footnotes_theme() {
+  return [
+    'footnote_link' => [
+      'variables' => [
+        'fn'    => NULL,
+      ],
+    ],
+    'footnote_list' => [
+      'variables' => [
+        'footnotes'=> NULL,
+      ],
+    ],
+  ];
+}
+
+
+/**
+ * Helper for other filters, check if Footnotes is present in your filter chain.
+ *
+ * Note: Due to changes in Filter API, the arguments to this function have
+ * changed in Drupal 7.
+ *
+ * Other filters may leverage the Footnotes functionality in a simple way:
+ * by outputting markup with <fn>...</fn> tags within.
+ *
+ * This creates a dependency, the Footnotes filter must be present later in
+ * "Input format". By calling this helper function the other filters that
+ * depend on Footnotes may check whether Footnotes is present later in the chain
+ * of filters in the current Input format.
+ *
+ * If this function returns true, the caller may depend on Footnotes. Function
+ * returns false if caller may not depend on Footnotes.
+ *
+ * You should also put "dependencies = footnotes" in your module.info file.
+ *
+ * Example usage:
+ * <code>
+ * _filter_example_process( $text, $filter, $format ) {
+ *   ...
+ *   if(footnotes_is_footnotes_later($format, $filter)) {
+ *     //output markup which may include [fn] tags
+ *   }
+ *   else {
+ *     // must make do without footnotes features
+ *     // can also emit warning/error that user should install and configure
+ *     // footnotes module
+ *   }
+ *   ...
+ * }
+ * </code>
+ *
+ * @param object $format
+ *   The text format object caller is part of.
+ * @param object $caller_filter
+ *   The filter object representing the caller (in this text format).
+ *
+ * @return True
+ *   If Footnotes is present after $caller in $format.
+ */
+function footnotes_is_footnotes_later($format, $caller_filter) {
+  return $format['filter_footnotes']['weight'] > $caller_filter['weight'];
+}
--- a/js/plugins/reference_footnotes/dialogs/footnotes.js
+++ b/js/plugins/reference_footnotes/dialogs/footnotes.js
@ -0,0 +1,116 @@
+(function() {
+    function referenceFootnotesDialog( editor, isEdit ) {
+        return {
+            title : Drupal.t('Reference Footnotes Dialog'),
+            minWidth : 500,
+            minHeight : 50,
+            contents : [
+                {
+                    id: 'info',
+                    label: Drupal.t('Add a reference footnote'),
+                    title: Drupal.t('Add a reference footnote'),
+                    elements:
+                        [
+                          {
+                            id: 'reference',
+                            type: 'select',
+                            items: [[" - None - ", 0]].concat(typeof(drupalSettings.bibcite_footnotes) !== 'undefined' ? drupalSettings.bibcite_footnotes.references : []),
+                            label: Drupal.t('Reference Footnote item:'),
+                            setup: function (element) {
+                              if (isEdit)
+                                this.setValue(element.getAttribute('reference'));
+                            }
+                          },
+                          {
+                            id: 'footnote',
+                            type: 'textarea',
+                            label: Drupal.t('Or add free-form footnote text :'),
+                            setup: function (element) {
+                                if (isEdit) {
+                                  var markup = element.getHtml();
+
+                                  this.setValue(markup);
+
+                                }
+                            }
+                          },
+                          {
+                            id: 'html-help',
+                            type: 'html',
+                            html: 'HTML tags can be used, e.g., &lt;strong&gt;, &lt;em&gt;, &lt;a href=&quot;...&quot;&gt;',
+                          },
+                          {
+                            id: 'page',
+                            type: 'text',
+                            labelLayout: 'horizontal',
+                            label: Drupal.t('Page(s):'),
+                            style: 'float:left:width:50px',
+                            setup: function (element) {
+                              if (isEdit) {
+                                this.setValue(element.getAttribute('page'));
+                              }
+                            }
+                          },
+                            {
+                                id: 'value',
+                                type: 'text',
+                                label: Drupal.t('Value :'),
+                                labelLayout: 'horizontal',
+                                style: 'float:left;width:200px;',
+                                setup: function (element) {
+                                    if (isEdit)
+                                        this.setValue(element.getAttribute('value'));
+                                }
+
+                            },
+                          {
+                            id: 'value-help',
+                            type: 'html',
+                            html: 'Leave blank for an automatic sequential reference number, or enter a custom footnote value',
+                          }
+                        ],
+                }
+            ],
+            onShow : function() {
+              if (isEdit) {
+                this.fakeObj = CKEDITOR.plugins.reference_footnotes.getSelectedFootnote(editor);
+                this.realObj = editor.restoreRealElement(this.fakeObj);
+              }
+              var select = this.parts.contents.$.getElementsByTagName('select');
+              var selectBox = select.item(0);
+              // Remove all but the default 'None' item from teh list.
+              var i;
+              for (i = selectBox.options.length - 1; i >= 1; i--) {
+                selectBox.remove(i)
+              }
+
+              // Re-add buttons from the current state of Settings.
+              if (typeof (drupalSettings.bibcite_footnotes) !== 'undefined') {
+
+                drupalSettings.bibcite_footnotes.references.forEach(function (reference) {
+                  var newReference = document.createElement('option');
+                  newReference.text = reference[0];
+                  newReference.setAttribute("value", reference[1]);
+                  selectBox.add(newReference);
+                });
+              }
+              this.setupContent( this.realObj );
+            },
+            onOk : function() {
+                var referenceNote = this.getValueOf('info', 'reference');
+                var textNote = this.getValueOf('info', 'footnote');
+                var page = this.getValueOf('info', 'page');
+                CKEDITOR.plugins.reference_footnotes.createFootnote( editor, this.realObj, textNote, this.getValueOf('info', 'value'), referenceNote, page);
+                delete this.fakeObj;
+                delete this.realObj;
+            }
+        }
+    }
+
+    CKEDITOR.dialog.add( 'createreferencefootnotes', function( editor ) {
+        return referenceFootnotesDialog( editor );
+    });
+    CKEDITOR.dialog.add( 'editreferencefootnotes', function( editor ) {
+        return referenceFootnotesDialog( editor, 1 );
+    });
+})();
--- a/js/plugins/reference_footnotes/icons/reference_footnotes.png
+++ b/js/plugins/reference_footnotes/icons/reference_footnotes.png
--- a/js/plugins/reference_footnotes/images/bgcolor.png
+++ b/js/plugins/reference_footnotes/images/bgcolor.png
--- a/js/plugins/reference_footnotes/images/fn.png
+++ b/js/plugins/reference_footnotes/images/fn.png
--- a/js/plugins/reference_footnotes/images/fn_icon.png
+++ b/js/plugins/reference_footnotes/images/fn_icon.png
--- a/js/plugins/reference_footnotes/images/fn_icon3.png
+++ b/js/plugins/reference_footnotes/images/fn_icon3.png
--- a/js/plugins/reference_footnotes/images/footnotes.png
+++ b/js/plugins/reference_footnotes/images/footnotes.png
--- a/js/plugins/reference_footnotes/images/hidpi/bgcolor.png
+++ b/js/plugins/reference_footnotes/images/hidpi/bgcolor.png
--- a/js/plugins/reference_footnotes/images/hidpi/textcolor.png
+++ b/js/plugins/reference_footnotes/images/hidpi/textcolor.png
--- a/js/plugins/reference_footnotes/images/icon.png
+++ b/js/plugins/reference_footnotes/images/icon.png
--- a/js/plugins/reference_footnotes/images/note_add.png
+++ b/js/plugins/reference_footnotes/images/note_add.png
--- a/js/plugins/reference_footnotes/images/textcolor.png
+++ b/js/plugins/reference_footnotes/images/textcolor.png
--- a/js/plugins/reference_footnotes/plugin.js
+++ b/js/plugins/reference_footnotes/plugin.js
@ -0,0 +1,143 @@
+(function() {
+    CKEDITOR.plugins.add( 'reference_footnotes',
+        {
+            requires : [ 'fakeobjects','dialog' ],
+            icons: 'reference_footnotes',
+            onLoad: function() {
+                var icon_path = window.location.origin + this.path + 'images/fn_icon2.png';
+                var ref_icon_path = window.location.origin + this.path + 'images/fn_icon3.png';
+                CKEDITOR.addCss(
+                    '.cke_reference_footnote' +
+                    '{' +
+                    'background-image: url(' + CKEDITOR.getUrl( ref_icon_path ) + ');' +
+                    'background-position: center center;' +
+                    'background-repeat: no-repeat;' +
+                    'width: 16px;' +
+                    'height: 16px;' +
+                    '}' +
+                    '.cke_footnote' +
+                    '{' +
+                    'background-image: url(' + CKEDITOR.getUrl( icon_path ) + ');' +
+                    'background-position: center center;' +
+                    'background-repeat: no-repeat;' +
+                    'width: 16px;' +
+                    'height: 16px;' +
+                    '}'
+
+                );
+            },
+            beforeInit: function( editor )
+            {
+                // Adapt some critical editor configuration for better support
+                // of BBCode environment.
+                var config = editor.config;
+                CKEDITOR.tools.extend( config,
+                    {
+                        enterMode : CKEDITOR.ENTER_BR,
+                        basicEntities: false,
+                        entities : false,
+                        fillEmptyBlocks : false
+                    }, true );
+            },
+            init: function( editor )
+            {
+
+                editor.addCommand('createreferencefootnotes', new CKEDITOR.dialogCommand('createreferencefootnotes', {
+                    allowedContent: 'fn[value]'
+                }));
+                editor.addCommand('editreferencefootnotes', new CKEDITOR.dialogCommand('editreferencefootnotes', {
+                    allowedContent: 'fn[value]'
+                }));
+
+                // Drupal Wysiwyg requirement: The first argument to editor.ui.addButton()
+                // must be equal to the key used in $plugins[<pluginName>]['buttons'][<key>]
+                // in hook_wysiwyg_plugin().
+                editor.ui.addButton && editor.ui.addButton( 'reference_footnotes', {
+                    label: Drupal.t('Add a reference footnote'),
+                    command: 'createreferencefootnotes',
+                    icon: 'reference_footnotes'
+                });
+
+                if (editor.addMenuItems) {
+                    editor.addMenuGroup('reference_footnotes', 100);
+                    editor.addMenuItems({
+                        footnotes: {
+                            label: Drupal.t('Edit footnote'),
+                            command: 'editreferencefootnotes',
+                            icon: 'reference_footnotes',
+                            group: 'reference_footnotes'
+                        }
+                    });
+                }
+                if (editor.contextMenu) {
+                    editor.contextMenu.addListener( function( element, selection ) {
+                        if ( !element || element.data('cke-real-element-type') != 'fn' )
+                            return null;
+
+                        return { footnotes: CKEDITOR.TRISTATE_ON };
+                    });
+                }
+
+                editor.on( 'doubleclick', function( evt ) {
+                    if ( CKEDITOR.plugins.reference_footnotes.getSelectedFootnote( editor ) )
+                    {
+                      evt.data.dialog = 'editreferencefootnotes';
+                    }
+                }, null, null, 1); // Ensure this event fires after the 'footnotes' event so we can decide which dialog to show.
+
+                CKEDITOR.dialog.add( 'createreferencefootnotes', this.path + 'dialogs/footnotes.js' );
+                CKEDITOR.dialog.add( 'editreferencefootnotes', this.path + 'dialogs/footnotes.js' );
+            },
+            afterInit : function( editor ) {
+                var dataProcessor = editor.dataProcessor,
+                    dataFilter = dataProcessor && dataProcessor.dataFilter;
+
+                if (dataFilter) {
+                    dataFilter.addRules({
+                        elements: {
+                            fn: function(element ) {
+
+                              return editor.createFakeParserElement(element, 'cke_reference_footnote', 'hiddenfield', false);
+
+                            }
+                        }
+                    });
+                }
+            }
+        });
+})();
+
+CKEDITOR.plugins.reference_footnotes = {
+    createFootnote: function( editor, origElement, text, value, reference, page) {
+        if (!origElement) {
+            var realElement = CKEDITOR.dom.element.createFromHtml('<fn></fn>');
+        }
+        else {
+            realElement = origElement;
+        }
+
+        if (text && text.length > 0 ) {
+            realElement.setHtml(text);
+        }
+        realElement.setAttribute('value',value);
+        if (page && page.length > 0) {
+            realElement.setAttribute('page', page);
+        }
+        if (reference && reference.length > 0) {
+            realElement.setAttribute('reference', reference);
+        }
+
+        var fakeElement = editor.createFakeElement( realElement , 'cke_reference_footnote', 'hiddenfield', false );
+        editor.insertElement(fakeElement);
+    },
+
+    getSelectedFootnote: function( editor ) {
+        var selection = editor.getSelection();
+        var element = selection.getSelectedElement();
+        var seltype = selection.getType();
+
+        if ( seltype == CKEDITOR.SELECTION_ELEMENT && element.data('cke-real-element-type') == 'hiddenfield') {
+            return element;
+        }
+    }
+};
--- a/js/replace_citations.js
+++ b/js/replace_citations.js
@ -0,0 +1,28 @@
+/**
+ * @file
+ * Provides JavaScript additions to entity embed dialog.
+ *
+ * This file provides popup windows for previewing embedded entities from the
+ * embed dialog.
+ */
+
+(function ($, Drupal) {
+
+  "use strict";
+
+  Drupal.behaviors.bibciteFootnotesReplaceCitations = {
+    attach: function attach(context, settings) {
+      /*
+      if (CKEDITOR.instances) {
+        for (var instance in CKEDITOR.instances) {
+          var editor = CKEDITOR.instances[instance];
+          var config = editor.config;
+          var name = editor.name;
+          editor.destroy();
+          CKEDITOR.replace(name, config);
+        }
+      }
+      */
+    }
+  }
+})(jQuery, Drupal);
--- a/src/CitationTools.php
+++ b/src/CitationTools.php
@ -0,0 +1,24 @@
+<?php
+/**
+ * Created by PhpStorm.
+ * User: aoneill
+ * Date: 2018-10-30
+ * Time: 2:36 PM
+ */
+
+namespace Drupal\bibcite_footnotes;
+
+
+class CitationTools {
+
+  public function getRenderableReference($reference_entity) {
+    if (is_numeric($reference_entity)) {
+      $reference_entity = \Drupal::entityTypeManager()
+        ->getStorage('bibcite_reference')
+        ->load($reference_entity);
+    }
+    $serializer = \Drupal::service('serializer');
+    $data = $serializer->normalize($reference_entity, 'csl');
+    return ['#theme' => 'bibcite_citation', '#data' => $data];
+  }
+}
--- a/src/Plugin/BibCiteProcessor/CiteprocPhpInline.php
+++ b/src/Plugin/BibCiteProcessor/CiteprocPhpInline.php
@ -0,0 +1,76 @@
+<?php
+
+namespace Drupal\bibcite_footnotes\Plugin\BibCiteProcessor;
+
+//use AcademicPuma\CiteProc\CiteProc;
+use Seboettg\CiteProc\CiteProc;
+use Drupal\Core\Config\ConfigFactoryInterface;
+use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
+use Drupal\bibcite\Plugin\BibCiteProcessorBase;
+use Drupal\bibcite\Plugin\BibCiteProcessorInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Defines a style provider based on citeproc-php library.
+ *
+ * Extended to support inline citation links based on the CSL.
+ *
+ * @BibCiteProcessor(
+ *   id = "citeproc-php",
+ *   label = @Translation("Citeproc PHP"),
+ * )
+ */
+class CiteprocPhpInline extends BibCiteProcessorBase implements BibCiteProcessorInterface, ContainerFactoryPluginInterface {
+
+  /**
+   * Config factory service.
+   *
+   * @var \Drupal\Core\Config\ConfigFactoryInterface
+   */
+  protected $configFactory;
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
+    return new static(
+      $configuration,
+      $plugin_id,
+      $plugin_definition,
+      $container->get('config.factory')
+    );
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function __construct(array $configuration, $plugin_id, $plugin_definition, ConfigFactoryInterface $config_factory) {
+    parent::__construct($configuration, $plugin_id, $plugin_definition);
+
+    $this->configFactory = $config_factory;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getDescription() {
+    return $this->t('Render citation by citeproc-php library');
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function render($data, $csl, $lang) {
+    $cite_proc = new CiteProc($csl, $lang);
+    $mode = !empty($data['mode']) ? $data['mode'] : NULL;
+
+    if (!$data instanceof \stdClass) {
+      $data = json_decode(json_encode($data));
+    }
+    if (!empty($data)) {
+      return $cite_proc->render($data, $mode);
+    }
+    return '';
+  }
+
+}
--- a/src/Plugin/CKEditorPlugin/Footnotes.php
+++ b/src/Plugin/CKEditorPlugin/Footnotes.php
@ -0,0 +1,54 @@
+<?php
+
+namespace Drupal\footnotes\Plugin\CKEditorPlugin;
+
+use Drupal\ckeditor\CKEditorPluginBase;
+use Drupal\editor\Entity\Editor;
+use Drupal\Core\StringTranslation\StringTranslationTrait;
+
+/**
+ * Defines the "Footnotes" plugin.
+ *
+ * @CKEditorPlugin(
+ *   id = "footnotes",
+ *   label = @Translation("FootnotesButton")
+ * )
+ */
+class Footnotes extends CKEditorPluginBase {
+
+  use StringTranslationTrait;
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getDependencies(Editor $editor) {
+    return ['fakeobjects'];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getFile() {
+    return drupal_get_path('module', 'footnotes') . '/assets/js/ckeditor/plugin.js';
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getButtons() {
+    return [
+      'footnotes' => [
+        'label' => $this->t('Footnotes'),
+        'image' => drupal_get_path('module', 'footnotes') . '/assets/js/ckeditor/icons/footnotes.png',
+      ],
+    ];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getConfig(Editor $editor) {
+    return [];
+  }
+
+}
--- a/src/Plugin/CKEditorPlugin/ReferenceFootnotes.php
+++ b/src/Plugin/CKEditorPlugin/ReferenceFootnotes.php
@ -0,0 +1,78 @@
+<?php
+
+namespace Drupal\bibcite_footnotes\Plugin\CKEditorPlugin;
+
+use Drupal\ckeditor\CKEditorPluginBase;
+use Drupal\editor\Entity\Editor;
+
+/**
+ * Defines the "reference_footnotes" plugin.
+ *
+ * NOTE: The plugin ID ('id' key) corresponds to the CKEditor plugin name.
+ * It is the first argument of the CKEDITOR.plugins.add() function in the
+ * plugin.js file.
+ *
+ * @CKEditorPlugin(
+ *   id = "reference_footnotes",
+ *   label = @Translation("Reference Footnotes")
+ * )
+ */
+class ReferenceFootnotes extends CKEditorPluginBase {
+
+
+  /**
+   * {@inheritdoc}
+   *
+   * NOTE: The keys of the returned array corresponds to the CKEditor button
+   * names. They are the first argument of the editor.ui.addButton() or
+   * editor.ui.addRichCombo() functions in the plugin.js file.
+   */
+  public function getButtons() {
+    // Make sure that the path to the image matches the file structure of
+    // the CKEditor plugin you are implementing.
+    return [
+      'reference_footnotes' => [
+        'label' => t('Reference Footnotes'),
+        'image' => \Drupal::service('extension.list.module')->getPath('bibcite_footnotes') .
+          '/js/plugins/reference_footnotes/images/icon.png',
+      ],
+    ];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getFile() {
+    // Make sure that the path to the plugin.js matches the file structure of
+    // the CKEditor plugin you are implementing.
+    return \Drupal::service('extension.list.module')->getPath('bibcite_footnotes') . '/js/plugins/reference_footnotes/plugin.js';
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function isInternal() {
+    return FALSE;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getDependencies(Editor $editor) {
+    return ['fakeobjects'];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getLibraries(Editor $editor) {
+    return [];
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getConfig(Editor $editor) {
+    return [];
+  }
+}
--- a/src/Plugin/Filter/FootnotesFilter.php
+++ b/src/Plugin/Filter/FootnotesFilter.php
@ -0,0 +1,378 @@
+<?php
+
+namespace Drupal\footnotes\Plugin\Filter;
+
+use Drupal\Component\Utility\Xss;
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\StringTranslation\StringTranslationTrait;
+use Drupal\filter\FilterProcessResult;
+use Drupal\filter\Plugin\FilterBase;
+
+/**
+ * Provides a base filter for Footnotes filter.
+ *
+ * @Filter(
+ *   id = "filter_footnotes",
+ *   module = "footnotes",
+ *   title = @Translation("Footnotes filter"),
+ *   description = @Translation("You can insert footnotes directly into texts."),
+ *   type = \Drupal\filter\Plugin\FilterInterface::TYPE_TRANSFORM_IRREVERSIBLE,
+ *   cache = FALSE,
+ *   settings = {
+ *     "footnotes_collapse" = FALSE,
+ *     "footnotes_html" = FALSE
+ *   },
+ *   weight = 0
+ * )
+ */
+class FootnotesFilter extends FilterBase {
+
+  use StringTranslationTrait;
+
+  /**
+   * The renderer.
+   *
+   * @var \Drupal\Core\Render\RendererInterface
+   */
+  protected $renderer;
+
+  /**
+   * Constructs a FootnotesFilter object.
+   *
+   * @param array $configuration
+   *   A configuration array containing information about the plugin instance.
+   * @param string $plugin_id
+   *   The plugin_id for the plugin instance.
+   * @param array $plugin_definition
+   *   The plugin implementation definition.
+   */
+  public function __construct(array $configuration, $plugin_id, array $plugin_definition) {
+    parent::__construct($configuration, $plugin_id, $plugin_definition);
+    $this->renderer = \Drupal::service('renderer');
+  }
+
+  /**
+   * Get the tips for the filter.
+   *
+   * @param bool $long
+   *   If get the long or short tip.
+   *
+   * @return string
+   *   The tip to show for the user.
+   */
+  public function tips($long = FALSE) {
+    if ($long) {
+      return $this->t('You can insert footnotes directly into texts with <code>[fn]This text becomes a footnote.[/fn]</code>. This will be replaced with a running number (the footnote reference) and the text within the [fn] tags will be moved to the bottom of the page (the footnote). See <a href=":link">Footnotes Readme page</a> for additional usage options.', [':link' => 'http://drupal.org/project/footnotes">']);
+    }
+    else {
+      return $this->t('Use [fn]...[/fn] (or &lt;fn&gt;...&lt;/fn&gt;) to insert automatically numbered footnotes.');
+    }
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function process($text, $langcode) {
+    // Supporting both [fn] and <fn> now. Thanks to fletchgqc
+    // http://drupal.org/node/268026.
+    // Convert all square brackets to angle brackets. This way all further code
+    // just manipulates angle brackets. (Angle brackets are preferred here for
+    // the simple reason that square brackets are more tedious to use in
+    // regexps).
+    if (is_array($text)) {
+      implode($text);
+    }
+    $text = preg_replace('|\[fn([^\]]*)\]|', '<fn$1>', $text);
+    $text = preg_replace('|\[/fn\]|', '</fn>', $text);
+    $text = preg_replace('|\[footnotes([^\]]*)\]|', '<footnotes$1>', $text);
+
+    // Check that there are an even number of open and closing tags.
+    // If there is one closing tag missing, append this to the end.
+    // If there is more disparity, throw a warning and continue.
+    // A closing tag may sometimes be missing when we are processing a teaser
+    // and it has been cut in the middle of the footnote.
+    // See http://drupal.org/node/253326
+    $foo = [];
+    $open_tags = preg_match_all("|<fn([^>]*)>|", $text, $foo);
+    $close_tags = preg_match_all("|</fn>|", $text, $foo);
+
+    if ($open_tags == $close_tags + 1) {
+      $text = $text . '</fn>';
+    }
+    elseif ($open_tags > $close_tags + 1) {
+      trigger_error($this->t("You have unclosed fn tags. This is invalid and will
+        produce unpredictable results."));
+    }
+
+    // Before doing the replacement, the callback function needs to know which
+    // options to use.
+    $this->replaceCallback($this->settings, 'prepare');
+
+    $pattern = '|<fn([^>]*)>(.*?)</fn>|s';
+    $text = preg_replace_callback($pattern, [
+      $this,
+      'replaceCallback',
+    ], $text);
+
+    // Replace tag <footnotes> with the list of footnotes.
+    // If tag is not present, by default add the footnotes at the end.
+    // Thanks to acp on drupal.org for this idea. see
+    // http://drupal.org/node/87226.
+    $footer = $this->replaceCallback(NULL, 'output footer');
+    $pattern = '|(<footnotes([\ \/]*)>)|';
+    if (preg_match($pattern, $text) > 0) {
+      $text = preg_replace($pattern, $footer, $text, 1);
+    }
+    elseif (!empty($footer)) {
+      $text .= "\n\n" . $footer;
+    }
+    $result = new FilterProcessResult($text);
+    $result->setAttachments([
+      'library' => [
+        'footnotes/footnotes',
+      ],
+    ]);
+    return $result;
+  }
+
+  /**
+   * Helper function called from preg_replace_callback() above.
+   *
+   * Uses static vars to temporarily store footnotes found.
+   * This is not threadsafe, but PHP isn't.
+   *
+   * @param mixed $matches
+   *   Elements from array:
+   *   - 0: complete matched string.
+   *   - 1: tag name.
+   *   - 2: tag attributes.
+   *   - 3: tag content.
+   * @param string $op
+   *   Operation.
+   *
+   * @return string
+   *   Return the string processed by geshi library.
+   */
+  protected function replaceCallback($matches, $op = '') {
+    static $opt_collapse = 0;
+    static $opt_html = 0;
+    static $n = 0;
+    static $store_matches = [];
+    static $used_values = [];
+    $str = '';
+
+    if ($op == 'prepare') {
+      // In the 'prepare' case, the first argument contains the options to use.
+      // The name 'matches' is incorrect, we just use the variable anyway.
+      $opt_collapse = $matches['footnotes_collapse'];
+      $opt_html = $matches['footnotes_html'];
+      return 0;
+    }
+
+    if ($op == 'output footer') {
+      if (count($store_matches) > 0) {
+        // Only if there are stored fn matches, pass the array of fns to be
+        // themed as a list Drupal 7 requires we use "render element" which
+        // just introduces a wrapper around the old array.
+        // @FIXME
+        // theme() has been renamed to _theme() and should NEVER be called
+        // directly. Calling _theme() directly can alter the expected output and
+        // potentially introduce  security issues
+        // (see https://www.drupal.org/node/2195739). You should use renderable
+        // arrays instead. @see https://www.drupal.org/node/2195739
+        $markup = [
+          '#theme' => 'footnote_list',
+          '#footnotes' => $store_matches,
+        ];
+        $str = $this->renderer->render($markup);
+      }
+      // Reset the static variables so they can be used again next time.
+      $n = 0;
+      $store_matches = [];
+      $used_values = [];
+
+      return $str;
+    }
+
+    // Default op: act as called by preg_replace_callback()
+    // Random string used to ensure footnote id's are unique, even
+    // when contents of multiple nodes reside on same page.
+    // (fixes http://drupal.org/node/194558).
+    $randstr = $this->randstr();
+
+    $value = '';
+    // Did the pattern match anything in the <fn> tag?
+    if ($matches[1]) {
+      // See if value attribute can parsed, either well-formed in quotes eg
+      // <fn value="3">.
+      if (preg_match('|value=["\'](.*?)["\']|', $matches[1], $value_match)) {
+        $value = $value_match[1];
+        // Or without quotes eg <fn value=8>.
+      }
+      elseif (preg_match('|value=(\S*)|', $matches[1], $value_match)) {
+        $value = $value_match[1];
+      }
+    }
+
+    if ($value) {
+      // A value label was found. If it is numeric, record it in $n so further
+      // notes can increment from there.
+      // After adding support for multiple references to same footnote in the
+      // body (http://drupal.org/node/636808) also must check that $n is
+      // monotonously increasing.
+      if (is_numeric($value) && $n < $value) {
+        $n = $value;
+      }
+    }
+    elseif ($opt_collapse and $value_existing = $this->findFootnote($matches[2], $store_matches)) {
+      // An identical footnote already exists. Set value to the previously
+      // existing value.
+      $value = $value_existing;
+    }
+    else {
+      // No value label, either a plain <fn> or unparsable attributes. Increment
+      // the footnote counter, set label equal to it.
+      $n++;
+      $value = $n;
+    }
+
+    // Remove illegal characters from $value so it can be used as an HTML id
+    // attribute.
+    $value_id = preg_replace('|[^\w\-]|', '', $value);
+
+    // Create a sanitized version of $text that is suitable for using as HTML
+    // attribute value. (In particular, as the title attribute to the footnote
+    // link).
+    $allowed_tags = [];
+    $text_clean = Xss::filter($matches['2'], $allowed_tags);
+    // HTML attribute cannot contain quotes.
+    $text_clean = str_replace('"', "&quot;", $text_clean);
+    // Remove newlines. Browsers don't support them anyway and they'll confuse
+    // line break converter in filter.module.
+    $text_clean = str_replace("\n", " ", $text_clean);
+    $text_clean = str_replace("\r", "", $text_clean);
+
+    // Create a footnote item as an array.
+    $fn = [
+      'value' => $value,
+      'text' => $opt_html ? html_entity_decode($matches[2]) : $matches[2],
+      'text_clean' => $text_clean,
+      'fn_id' => 'footnote' . $value_id . '_' . $randstr,
+      'ref_id' => 'footnoteref' . $value_id . '_' . $randstr,
+    ];
+
+    // We now allow to repeat the footnote value label, in which case the link
+    // to the previously existing footnote is returned. Content of the current
+    // footnote is ignored. See http://drupal.org/node/636808 .
+    if (!in_array($value, $used_values)) {
+      // This is the normal case, add the footnote to $store_matches.
+      // Store the footnote item.
+      array_push($store_matches, $fn);
+      array_push($used_values, $value);
+    }
+    else {
+      // A footnote with the same label already exists.
+      // Use the text and id from the first footnote with this value.
+      // Any text in this footnote is discarded.
+      $i = array_search($value, $used_values);
+      $fn['text'] = $store_matches[$i]['text'];
+      $fn['text_clean'] = $store_matches[$i]['text_clean'];
+      $fn['fn_id'] = $store_matches[$i]['fn_id'];
+      // Push the new ref_id into the first occurrence of this footnote label
+      // The stored footnote thus holds a list of ref_id's rather than just one
+      // id.
+      $ref_array = is_array($store_matches[$i]['ref_id']) ? $store_matches[$i]['ref_id'] : [$store_matches[$i]['ref_id']];
+      array_push($ref_array, $fn['ref_id']);
+      $store_matches[$i]['ref_id'] = $ref_array;
+    }
+
+    // Return the item themed into a footnote link.
+    // Drupal 7 requires we use "render element" which just introduces a wrapper
+    // around the old array.
+    $fn = [
+      '#theme' => 'footnote_link',
+      '#fn' => $fn,
+    ];
+    $result = $this->renderer->render($fn);
+
+    return $result;
+  }
+
+  /**
+   * Helper function to return a random text string.
+   *
+   * @return string
+   *   Random (lowercase) alphanumeric string.
+   */
+  public function randstr() {
+    $chars = "abcdefghijklmnopqrstuwxyz1234567890";
+    $str = "";
+
+    // Seeding with srand() not necessary in modern PHP versions.
+    for ($i = 0; $i < 7; $i++) {
+      $n = rand(0, strlen($chars) - 1);
+      $str .= substr($chars, $n, 1);
+    }
+    return $str;
+  }
+
+  /**
+   * Create the settings form for the filter.
+   *
+   * @param array $form
+   *   A minimally prepopulated form array.
+   * @param \Drupal\Core\Form\FormStateInterface $form_state
+   *   The state of the (entire) configuration form.
+   *
+   * @return array
+   *   The $form array with additional form elements for the settings of
+   *   this filter. The submitted form values should match $this->settings.
+   *
+   * @todo Add validation of submited form values, it already exists for
+   *       drupal 7, must update it only.
+   */
+  public function settingsForm(array $form, FormStateInterface $form_state) {
+    $settings['footnotes_collapse'] = [
+      '#type' => 'checkbox',
+      '#title' => $this->t('Collapse footnotes with identical content'),
+      '#default_value' => $this->settings['footnotes_collapse'],
+      '#description' => $this->t('If two footnotes have the exact same content, they will be collapsed into one as if using the same value="" attribute.'),
+    ];
+    $settings['footnotes_html'] = [
+      '#type' => 'checkbox',
+      '#title' => $this->t('Handle footnote text as HTML'),
+      '#default_value' => $this->settings['footnotes_html'],
+      '#description' => $this->t('If not checked, a HTML tag in the footnote text will be shown as-is to the user.'),
+    ];
+    return $settings;
+  }
+
+  /**
+   * Search the $store_matches array for footnote text that matches.
+   *
+   * Note: This does a linear search on the $store_matches array. For a large
+   * list of footnotes it would be more efficient to maintain a separate array
+   * with the footnote content as key, in order to do a hash lookup at this
+   * stage. Since you typically only have a handful of footnotes, this simple
+   * search is assumed to be more efficient, but was not tested.
+   *
+   * @param string $text
+   *   The footnote text.
+   * @param array $store_matches
+   *   The matches array.
+   *
+   * @return string|false
+   *   The value of the existing footnote, FALSE otherwise.
+   */
+  private function findFootnote($text, array &$store_matches) {
+    if (!empty($store_matches)) {
+      foreach ($store_matches as &$fn) {
+        if ($fn['text'] == $text) {
+          return $fn['value'];
+        }
+      }
+    }
+    return FALSE;
+  }
+
+}
--- a/src/Plugin/Filter/ReferenceFootnotesFilter.php
+++ b/src/Plugin/Filter/ReferenceFootnotesFilter.php
@ -0,0 +1,300 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Drupal\bibcite_footnotes\Plugin\Filter;
+
+use Drupal\Component\Utility\Xss;
+use Drupal\Core\Config\Config;
+use Drupal\Core\Config\ConfigFactoryInterface;
+use Drupal\Core\Config\ImmutableConfig;
+use Drupal\Core\Form\FormStateInterface;
+use Drupal\Core\Render\RendererInterface;
+use Drupal\filter\FilterProcessResult;
+use Drupal\filter\Plugin\FilterBase;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
+
+/**
+ * Reference Footnotes filter.
+ *
+ * @Filter(
+ *   id = "filter_reference_footnotes",
+ *   title = @Translation("Reference Footnotes filter"),
+ *   description = @Translation("You can insert footnotes directly into texts."),
+ *   type = \Drupal\filter\Plugin\FilterInterface::TYPE_TRANSFORM_IRREVERSIBLE,
+ *   cache = FALSE,
+ *   settings = {
+ *     "footnotes_collapse" = FALSE,
+ *     "footnotes_ibid" = FALSE,
+ *     "notes_section_label" = "Notes",
+ *     "reference_dont_show_backlink_text" = FALSE,
+ *     "works_cited_sort_by" = "weight"
+ *   },
+ *   weight = 0
+ * )
+ */
+final class ReferenceFootnotesFilter extends FilterBase implements ContainerFactoryPluginInterface {
+
+  protected RendererInterface $renderer;
+
+  protected ImmutableConfig $config;
+
+  protected Config $configEditable;
+
+  public function __construct(
+    array $configuration,
+    string $plugin_id,
+    array $plugin_definition,
+    RendererInterface $renderer,
+    ConfigFactoryInterface $configFactory,
+  ) {
+    parent::__construct($configuration, $plugin_id, $plugin_definition);
+
+    $this->renderer = $renderer;
+    $this->config = $configFactory->get('reference_footnotes.settings');
+    $this->configEditable = $configFactory->getEditable('reference_footnotes.settings');
+  }
+
+  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition): self {
+    return new self(
+      $configuration,
+      (string) $plugin_id,
+      $plugin_definition,
+      $container->get('renderer'),
+      $container->get('config.factory'),
+    );
+  }
+
+  public function settingsForm(array $form, FormStateInterface $form_state): array {
+    $settings['footnotes_collapse'] = [
+      '#type' => 'checkbox',
+      '#title' => $this->t('Collapse reference footnotes with identical content'),
+      '#default_value' => (bool) ($this->settings['footnotes_collapse'] ?? FALSE),
+      '#description' => $this->t('If two reference footnotes have the exact same content, they will be collapsed into one as if using the same value="" attribute.'),
+    ];
+
+    $settings['footnotes_ibid'] = [
+      '#type' => 'checkbox',
+      '#title' => $this->t('Display subsequent instances of multiple references with \'Ibid.\''),
+      '#default_value' => (bool) ($this->settings['footnotes_ibid'] ?? FALSE),
+    ];
+
+    $settings['notes_section_label'] = [
+      '#type' => 'textfield',
+      '#title' => $this->t('Notes section heading label'),
+      '#default_value' => (string) ($this->settings['notes_section_label'] ?? 'Notes'),
+    ];
+
+    $settings['reference_dont_show_backlink_text'] = [
+      '#type' => 'checkbox',
+      '#title' => $this->t("Don't show note 'value' text in reference list."),
+      '#description' => $this->t("Suitable for MLA-style citations, like (Smith, 33-22)"),
+      '#default_value' => (bool) ($this->settings['reference_dont_show_backlink_text'] ?? FALSE),
+    ];
+
+    $settings['works_cited_sort_by'] = [
+      '#type' => 'select',
+      '#title' => $this->t('Sort Works Cited list by'),
+      '#options' => [
+        'weight' => $this->t('Manually'),
+        'alphabetical' => $this->t('Alphabetically'),
+      ],
+      '#default_value' => (string) ($this->settings['works_cited_sort_by'] ?? 'weight'),
+    ];
+
+    return $settings;
+  }
+
+  /**
+   * Helper function called from preg_replace_callback().
+   *
+   * Uses static vars to temporarily store footnotes found.
+   * This is not threadsafe, but PHP isn't.
+   */
+  protected function replaceCallback(array $matches, string $op = ''): string|int {
+    static $opt_collapse = 0;
+    static $n = 0;
+    static $store_matches = [];
+    static $used_values = [];
+
+    if ($op === 'prepare') {
+      // In the 'prepare' case, $matches contains the options to use.
+      $opt_collapse = !empty($matches['footnotes_collapse']);
+      return 0;
+    }
+
+    if ($op === 'output footer') {
+      $str = '';
+
+      if (count($store_matches) > 0) {
+        if (!empty($this->settings['footnotes_ibid'])) {
+          $this->ibidemify($store_matches);
+        }
+
+        $markup = [
+          '#theme' => 'bibcite_footnote_list',
+          '#notes' => $store_matches,
+          '#config' => $this->settings,
+        ];
+        $str = (string) $this->renderer->render($markup, FALSE);
+      }
+
+      // Reset static variables.
+      $n = 0;
+      $store_matches = [];
+      $used_values = [];
+
+      return $str;
+    }
+
+    // Default op: act as called by preg_replace_callback().
+    $randstr = $this->randstr();
+
+    $value = $this->extractAttribute($matches, 'value');
+    $page = $this->extractAttribute($matches, 'page');
+    $reference = $this->extractAttribute($matches, 'reference');
+
+    if ($value !== '') {
+      if (is_numeric($value) && $n < (int) $value) {
+        $n = (int) $value;
+      }
+    }
+    elseif ($opt_collapse && ($value_existing = $this->findFootnote($matches[2], $reference, $store_matches)) !== FALSE) {
+      $value = (string) $value_existing;
+    }
+    else {
+      $n++;
+      $value = (string) $n;
+    }
+
+    $value_id = preg_replace('|[^\w\-]|', '', $value) ?? '';
+
+    // Sanitize content for title attribute.
+    $allowed_tags = [];
+    $text_clean = Xss::filter($matches[2], $allowed_tags);
+    $text_clean = str_replace('"', '&quot;', $text_clean);
+    $text_clean = str_replace("\n", ' ', $text_clean);
+    $text_clean = str_replace("\r", '', $text_clean);
+
+    $fn = [
+      'value' => $value,
+      'text' => $matches[2],
+      'text_clean' => $text_clean,
+      'page' => $page,
+      'reference' => $reference,
+      'fn_id' => 'footnote' . $value_id . '_' . $randstr,
+      'ref_id' => 'footnoteref' . $value_id . '_' . $randstr,
+    ];
+
+    if (!in_array($value, $used_values, TRUE)) {
+      $store_matches[] = $fn;
+      $used_values[] = $value;
+    }
+    else {
+      $i = array_search($value, $used_values, TRUE);
+      $fn['text'] = $store_matches[$i]['text'];
+      $fn['text_clean'] = $store_matches[$i]['text_clean'];
+      $fn['fn_id'] = $store_matches[$i]['fn_id'];
+
+      $ref_array = is_array($store_matches[$i]['ref_id']) ? $store_matches[$i]['ref_id'] : [$store_matches[$i]['ref_id']];
+      $ref_array[] = $fn['ref_id'];
+      $store_matches[$i]['ref_id'] = $ref_array;
+    }
+
+    $render_array = [
+      '#theme' => 'bibcite_footnote_link',
+      'fn' => $fn,
+    ];
+
+    return (string) $this->renderer->render($render_array, FALSE);
+  }
+
+  private function findFootnote(string $text, string $reference, array &$store_matches): string|false {
+    foreach ($store_matches as $fn) {
+      if (($fn['text'] ?? NULL) === $text && ($fn['reference'] ?? NULL) === $reference) {
+        return (string) $fn['value'];
+      }
+    }
+    return FALSE;
+  }
+
+  protected function extractAttribute(array $matches, string $attribute): string {
+    $value = '';
+    if (!empty($matches[1])) {
+      if (preg_match('|' . preg_quote($attribute, '|') . '=["\'](.*?)["\']|', $matches[1], $value_match)) {
+        $value = $value_match[1];
+      }
+      elseif (preg_match('|' . preg_quote($attribute, '|') . '=(\S*)|', $matches[1], $value_match)) {
+        $value = $value_match[1];
+      }
+    }
+    return $value;
+  }
+
+  protected function ibidemify(array &$footnotes): void {
+    $prev_reference_id = FALSE;
+    foreach ($footnotes as $index => $fn) {
+      if ($prev_reference_id && ($fn['reference'] ?? NULL) === $prev_reference_id) {
+        $footnotes[$index]['ibid'] = TRUE;
+        continue;
+      }
+      $prev_reference_id = $fn['reference'] ?? FALSE;
+    }
+  }
+
+  public function process($text, $langcode): FilterProcessResult {
+    if (is_array($text)) {
+      $text = implode('', $text);
+    }
+
+    $text = preg_replace('|\[fn([^\]]*)\]|', '<fn$1>', (string) $text);
+    $text = preg_replace('|\[/fn\]|', '</fn>', (string) $text);
+    $text = preg_replace('|\[footnotes([^\]]*)\]|', '<footnotes$1>', (string) $text);
+
+    $foo = [];
+    $open_tags = preg_match_all("|<fn([^>]*)>|", $text, $foo);
+    $close_tags = preg_match_all("|</fn>|", $text, $foo);
+
+    if ($open_tags === $close_tags + 1) {
+      $text .= '</fn>';
+    }
+    elseif ($open_tags > $close_tags + 1) {
+      // Keep behavior, but avoid translating inside trigger_error message.
+      trigger_error('You have unclosed fn tags. This is invalid and will produce unpredictable results.');
+    }
+
+    // Let the callback know which options to use.
+    $this->replaceCallback($this->settings, 'prepare');
+
+    $pattern = '|<fn([^>]*)>(.*?)</fn>|s';
+    $text = preg_replace_callback($pattern, [$this, 'replaceCallback'], $text);
+
+    $footer = $this->replaceCallback([], 'output footer');
+    $pattern = '|(<footnotes([^\]]*)>)|';
+
+    if (preg_match($pattern, $text) > 0) {
+      $text = preg_replace($pattern, (string) $footer, $text, 1);
+    }
+    elseif (!empty($footer)) {
+      $text .= "\n\n" . $footer;
+    }
+
+    $result = new FilterProcessResult((string) $text);
+    $result->setAttachments([
+      'library' => ['footnotes/footnotes'],
+    ]);
+    return $result;
+  }
+
+  public function randstr(): string {
+    $chars = 'abcdefghijklmnopqrstuwxyz1234567890';
+    $str = '';
+    for ($i = 0; $i < 7; $i++) {
+      $n = rand(0, strlen($chars) - 1);
+      $str .= substr($chars, $n, 1);
+    }
+    return $str;
+  }
+
+}
--- a/templates/bibcite-footnote-link.html.twig
+++ b/templates/bibcite-footnote-link.html.twig
@ -0,0 +1,16 @@
+{#
+/**
+ * @file footnote-link.html.twig
+ * Default theme implementation to present an inline reference footnote link.
+ *
+ * Available variables:
+ * - fn: Components of the footnote
+ * - link: Rendered link.
+ * - attributes: HTML attributes for the container element.
+ *
+ * @see template_preprocess_footnote_link().
+ *
+ * @ingroup themeable
+ */
+#}
+{{ fn }}
--- a/templates/bibcite-footnote-list.html.twig
+++ b/templates/bibcite-footnote-list.html.twig
@ -0,0 +1,21 @@
+{#
+/**
+ * @file footnote-list.html.twig
+ * Default theme implementation to present a list of reference footnotes.
+ *
+ * Available variables:
+ * - footnotess: A list of footnotes
+ * - notes: A list of free-form notes
+ * - references: A list of citations
+ * - attributes: HTML attributes for the container element.
+ *
+ * @see template_preprocess_footnote_list().
+ *
+ * @ingroup themeable
+ */
+#}
+
+<div{{ attributes.addClass('footnote-list') }}>
+    {{ notes }}
+    {{ references }}
+</div>
--- a/templates/footnote-link.html.twig
+++ b/templates/footnote-link.html.twig
@ -0,0 +1,2 @@
+{# footnotes/footnote-link.html.twig #}
+<a class="see-footnote" id="{{ fn.ref_id }}" title="{{ fn.text_clean }}" href="#{{ fn.fn_id }}">{{ fn.value }}</a>
--- a/templates/footnote-list.html.twig
+++ b/templates/footnote-list.html.twig
@ -0,0 +1,23 @@
+{# footnotes/footnote-list.html.twig #}
+<ul class="footnotes">
+  {% for fn in footnotes %}
+    {% if fn.ref_id is iterable %}
+      {#
+      // Output footnote that has more than one reference to it in the body.
+      // The only difference is to insert backlinks to all references.
+      // Helper: we need to enumerate a, b, c...
+       #}
+        {% set abc = "abcdefghijklmnopqrstuvwxyz"|split('') %}
+        {% set i = 0 %}
+      <li class="footnote" id="{{ fn.fn_id }}"><a href="#{{ fn.ref_id.0 }}" class="footnote-label">{{ fn.value }}</a>
+      {% for ref in fn.ref_id %}
+        <a class="footnote-multi" href="#{{ ref }}">{{ attribute(abc, i) }}</a>
+        {% set i = i + 1 %}
+      {% endfor %}
+      {{ fn.text|raw }}</li>
+    {% else %}
+      {# Output normal footnote. #}
+      <li class="footnote" id="{{ fn.fn_id }}"><a class="footnote-label" href="#{{ fn.ref_id }}">{{ fn.value }}</a>{{ fn.text|raw }}</li>
+    {% endif %}
+  {% endfor %}
+</ul>
--- a/tests/src/Functional/FootnotesFilterPluginTest.php
+++ b/tests/src/Functional/FootnotesFilterPluginTest.php
@ -0,0 +1,168 @@
+<?php
+
+namespace Drupal\Tests\footnotes\Functional;
+
+use Drupal\Core\Session\AccountInterface;
+use Drupal\Core\StringTranslation\StringTranslationTrait;
+use Drupal\Tests\BrowserTestBase;
+
+/**
+ * Contains Footnotes Filter plugin functionality tests.
+ *
+ * @group footnotes
+ */
+class FootnotesFilterPluginTest extends BrowserTestBase {
+
+  use StringTranslationTrait;
+
+  /**
+   * {@inheritdoc}
+   */
+  protected static $modules = [
+    'fakeobjects',
+    'footnotes',
+    'node',
+  ];
+
+  /**
+   * An user with permissions to proper permissions.
+   *
+   * @var \Drupal\user\UserInterface
+   */
+  protected $adminUser;
+
+  /**
+   * Text format name.
+   *
+   * @var string
+   */
+  protected $formatName;
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp();
+
+    // Create a filter admin user.
+    $permissions = [
+      'administer filters',
+      'administer nodes',
+      'access administration pages',
+      'administer site configuration',
+    ];
+    $this->adminUser = $this->drupalCreateUser($permissions);
+    $this->formatName = strtolower($this->randomMachineName());
+
+    $this->drupalLogin($this->adminUser);
+    $this->createTextFormat();
+    $this->drupalCreateContentType(['type' => 'page']);
+  }
+
+  /**
+   * Tests CKEditor Filter plugin functionality.
+   */
+  public function testDefaultFunctionality() {
+    // Verify a title with HTML entities is properly escaped.
+    $text1 = 'This is the note one.';
+    $note1 = '[fn]' . $text1 . '[/fn]';
+    $text2 = 'And this is the note two.';
+    $note2 = "<fn>$text2</fn>";
+
+    $body = '<p>' . $this->randomMachineName(100) . $note1 . '</p><p>' .
+      $this->randomMachineName(100) . $note2 . '</p>';
+
+    // Create a node.
+    $node = $this->drupalCreateNode([
+      'title' => $this->randomString(),
+      'body' => [
+        0 => [
+          'value' => $body,
+          'format' => $this->formatName,
+        ],
+      ],
+    ]);
+
+    $this->drupalGet('node/' . $node->id());
+
+    // Footnote with [fn].
+    $this->assertNoRaw($note1);
+    $this->assertText($text1);
+
+    // Footnote with <fn>.
+    $this->assertNoRaw($note2);
+    $this->assertText($text2);
+
+    // Css file:
+    $this->assertRaw('/assets/css/footnotes.css');
+    // @todo currently additional settings doesn't work as expected.
+    // So we don't check additional settings for now.
+    // $this->createTextFormat(TRUE);
+    $text1 = 'This is the note one.';
+    $note1 = "[fn value='1']{$text1}[/fn]";
+    $text2 = 'And this is the note two.';
+    $note2 = "<fn value='1'>{$text2}</fn>";
+
+    $body = '<p>' . $this->randomMachineName(100) . $note1 . '</p><p>' .
+      $this->randomMachineName(100) . $note2 . '</p>';
+
+    // Create a node.
+    $node = $this->drupalCreateNode([
+      'title' => $this->randomString(),
+      'body' => [
+        0 => [
+          'value' => $body,
+          'format' => $this->formatName,
+        ],
+      ],
+    ]);
+
+    $this->drupalGet('node/' . $node->id());
+
+    // Footnote with [fn].
+    $this->assertNoRaw($note1);
+    $this->assertText($text1);
+
+    // Elements with the same value should be collapsed.
+    // @todo This should work only if footnotes_collapse setting is enabled.
+    $this->assertNoRaw($note2);
+    $this->assertNoText($text2);
+  }
+
+  /**
+   * Create a new text format.
+   *
+   * @param bool $additional_settings
+   *   Indicates if filter settings should be enabled.
+   */
+  protected function createTextFormat($additional_settings = FALSE) {
+    $button_groups = json_encode([
+      [
+        [
+          'name' => 'Tools',
+          'items' => ['Source', 'footnotes'],
+        ],
+      ],
+    ]);
+
+    $edit = [
+      'format' => $this->formatName,
+      'name' => $this->formatName,
+      'roles[' . AccountInterface::AUTHENTICATED_ROLE . ']' => TRUE,
+      'editor[editor]' => 'ckeditor',
+      'filters[filter_footnotes][status]' => TRUE,
+    ];
+    $this->drupalGet("admin/config/content/formats/add");
+    // Keep the "CKEditor" editor selected and click the "Configure" button.
+    $this->drupalPostForm(NULL, $edit, 'editor_configure');
+    $edit['editor[settings][toolbar][button_groups]'] = $button_groups;
+    $edit['filters[filter_footnotes][settings][footnotes_collapse]'] = $button_groups;
+    if ($additional_settings) {
+      $edit['filters[filter_footnotes][settings][footnotes_collapse]'] = 1;
+      $edit['filters[filter_footnotes][settings][footnotes_html]'] = 1;
+    }
+    $this->drupalPostForm(NULL, $edit, $this->t('Save configuration'));
+    $this->assertText($this->t('Added text format @format.', ['@format' => $this->formatName]));
+  }
+
+}
--- a/tests/src/FunctionalJavascript/FootnotesCkeditorPluginTest.php
+++ b/tests/src/FunctionalJavascript/FootnotesCkeditorPluginTest.php
@ -0,0 +1,176 @@
+<?php
+
+namespace Drupal\Tests\footnotes\FunctionalJavascript;
+
+use Drupal\Core\Entity\Entity\EntityFormDisplay;
+use Drupal\Core\StringTranslation\StringTranslationTrait;
+use Drupal\editor\Entity\Editor;
+use Drupal\field\Entity\FieldConfig;
+use Drupal\field\Entity\FieldStorageConfig;
+use Drupal\filter\Entity\FilterFormat;
+use Drupal\FunctionalJavascriptTests\WebDriverTestBase;
+use Drupal\node\Entity\NodeType;
+use Drupal\Tests\ckeditor\Traits\CKEditorTestTrait;
+
+/**
+ * Contains Footnotes CKEditor plugin functionality tests.
+ *
+ * @group footnotes
+ */
+class FootnotesCkeditorPluginTest extends WebDriverTestBase
+{
+
+  use StringTranslationTrait;
+  use CKEditorTestTrait;
+
+  /**
+   * {@inheritdoc}
+   */
+  protected $defaultTheme = 'stark';
+
+  /**
+   * The account.
+   *
+   * @var \Drupal\user\UserInterface
+   */
+  protected $account;
+
+  /**
+   * The FilterFormat config entity used for testing.
+   *
+   * @var \Drupal\filter\FilterFormatInterface
+   */
+  protected $filterFormat;
+
+  /**
+   * {@inheritdoc}
+   */
+  public static $modules = ['node', 'ckeditor', 'filter', 'ckeditor_test', 'fakeobjects', 'footnotes'];
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp()
+  {
+    parent::setUp();
+
+    // Create a text format and associate CKEditor.
+    $this->filterFormat = FilterFormat::create([
+      'format' => 'filtered_html',
+      'name' => 'Filtered HTML',
+      'filters' => [
+        'filter_footnotes' => [
+          'status' => TRUE,
+          'settings' => [
+            'footnotes_collapse' => 0,
+            'footnotes_html' => 0
+          ],
+        ],
+      ],
+    ]);
+    $this->filterFormat->save();
+
+    Editor::create([
+      'format' => 'filtered_html',
+      'editor' => 'ckeditor',
+      'settings' => [
+        'toolbar' => [
+          'rows' => [
+            [
+              [
+                'name' => 'All the things',
+                'items' => [
+                  'Source',
+                  'Bold',
+                  'Italic',
+                  'footnotes',
+                ],
+              ],
+            ],
+          ],
+        ],
+      ],
+    ])->save();
+
+    // Create a node type for testing.
+    NodeType::create(['type' => 'page', 'name' => 'page'])->save();
+
+    $field_storage = FieldStorageConfig::loadByName('node', 'body');
+
+    // Create a body field instance for the 'page' node type.
+    FieldConfig::create([
+      'field_storage' => $field_storage,
+      'bundle' => 'page',
+      'label' => 'Body',
+      'settings' => ['display_summary' => TRUE],
+      'required' => TRUE,
+    ])->save();
+
+    // Assign widget settings for the 'default' form mode.
+    EntityFormDisplay::create([
+      'targetEntityType' => 'node',
+      'bundle' => 'page',
+      'mode' => 'default',
+      'status' => TRUE,
+    ])->setComponent('body', ['type' => 'text_textarea_with_summary'])
+      ->save();
+
+    $this->account = $this->drupalCreateUser([
+      'administer nodes',
+      'create page content',
+      'use text format filtered_html',
+    ]);
+    $this->drupalLogin($this->account);
+  }
+
+  /**
+   * Tests CKEditor plugin functionality for body field.
+   */
+  public function testUi()
+  {
+    $session = $this->getSession();
+    $assert_session = $this->assertSession();
+
+    $this->drupalGet("node/add/page");
+    $page = $session->getPage();
+
+    $this->waitForEditor();
+    $this->pressEditorButton('footnotes');
+    $this->assertNotEmpty(
+      $assert_session->waitForElementVisible('css', '.cke_1.cke_editor_edit-body-0-value_dialog')
+    );
+    $assert_session->elementTextContains('css', 'table.cke_dialog .cke_dialog_title', $this->t('Footnotes Dialog'));
+    $assert_session->elementTextContains('css', '.cke_dialog_page_contents table tr:first-child', $this->t('Footnote text :'));
+    $assert_session->elementTextContains('css', '.cke_dialog_page_contents table tr:last-child', $this->t('Value :'));
+    $page->find('css', 'a.cke_dialog_ui_button_cancel')->click();
+
+    $this->assertEmpty($assert_session->elementExists('css', '.cke_1.cke_editor_edit-body-0-value_dialog')->isVisible());
+
+    $texts = ['Text one.', 'Text two.', 'Text tree', 'Text four', 'Text five'];
+    foreach ($texts as $key => $value) {
+      $this->pressEditorButton('footnotes');
+      $this->assertNotEmpty(
+        $assert_session->waitForElementVisible('css', '.cke_1.cke_editor_edit-body-0-value_dialog')
+      );
+      $assert_session->elementExists('css', '.cke_dialog_page_contents table tr:last-child input')->setValue($key);
+      $assert_session->elementExists('css', '.cke_dialog_page_contents table tr:first-child input')->setValue($value);
+      $page->find('css', 'a.cke_dialog_ui_button_ok')->click();
+
+      $this->assertEmpty($assert_session->elementExists('css', '.cke_1.cke_editor_edit-body-0-value_dialog')->isVisible());
+    }
+    $this->pressEditorButton('source');
+    $body_value = $assert_session->elementExists('css', '.cke .cke_contents .cke_source')->getValue();
+
+    $body_value = str_replace(["\r\n", "\r", "\n"], "", $body_value);
+    $body_value = trim($body_value);
+
+    $expected_value = '<p>';
+    foreach ($texts as $key => $value) {
+      $expected_value .= '<fn value="' . $key . '">' . $value . '</fn>';
+    }
+    $expected_value .= '</p>';
+
+    $this->assertEqual($body_value, $expected_value, $this->t('String, formed by CKEditor, is correct.'));
+  }
+
+}