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758 lines
14 KiB
758 lines
14 KiB
{ |
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"title":"High Resolution Time API", |
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"description":"Method to provide the current time in sub-millisecond resolution and such that it is not subject to system clock skew or adjustments. Called using `performance.now()`", |
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"spec":"https://www.w3.org/TR/hr-time/", |
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"status":"rec", |
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"links":[ |
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{ |
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"url":"https://developer.mozilla.org/en-US/docs/Web/API/Performance.now()", |
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"title":"MDN Web Docs - Performance.now" |
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}, |
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{ |
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"url":"https://developer.chrome.com/blog/when-milliseconds-are-not-enough-performance-now/", |
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"title":"HTML5Rocks article" |
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}, |
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{ |
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"url":"https://www.sitepoint.com/discovering-the-high-resolution-time-api/", |
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"title":"SitePoint article" |
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}, |
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{ |
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"url":"https://audero.it/demo/high-resolution-time-api-demo.html", |
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"title":"Demo" |
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} |
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], |
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"bugs":[ |
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{ |
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"description":"Older versions of Chrome and Opera on Windows have only millisecond precision. The fractional part is always near the very start or the very end of a millisecond. ([issue #158234](https://code.google.com/p/chromium/issues/detail?id=158234))." |
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}, |
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{ |
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"description":"The Spy in the Sandbox vulnerability is a class of JavaScript-based exploits that leverage the High Resolution Time API to detect CPU cache hit/miss on chosen plaintext data placed into cache by an attacker. [Full security research paper is here](http://arxiv.org/abs/1502.07373)" |
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} |
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], |
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"JS API" |
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"26.4":"y", |
|
"26.5":"y" |
|
}, |
|
"op_mini":{ |
|
"all":"n" |
|
}, |
|
"android":{ |
|
"2.1":"n", |
|
"2.2":"n", |
|
"2.3":"n", |
|
"3":"n", |
|
"4":"n", |
|
"4.1":"n", |
|
"4.2-4.3":"n", |
|
"4.4":"y", |
|
"4.4.3-4.4.4":"y", |
|
"147":"y" |
|
}, |
|
"bb":{ |
|
"7":"n", |
|
"10":"y" |
|
}, |
|
"op_mob":{ |
|
"10":"n", |
|
"11":"n", |
|
"11.1":"n", |
|
"11.5":"n", |
|
"12":"n", |
|
"12.1":"n", |
|
"80":"y" |
|
}, |
|
"and_chr":{ |
|
"147":"y" |
|
}, |
|
"and_ff":{ |
|
"150":"y" |
|
}, |
|
"ie_mob":{ |
|
"10":"y", |
|
"11":"y" |
|
}, |
|
"and_uc":{ |
|
"15.5":"y" |
|
}, |
|
"samsung":{ |
|
"4":"y", |
|
"5.0-5.4":"y", |
|
"6.2-6.4":"y", |
|
"7.2-7.4":"y", |
|
"8.2":"y", |
|
"9.2":"y", |
|
"10.1":"y", |
|
"11.1-11.2":"y", |
|
"12.0":"y", |
|
"13.0":"y", |
|
"14.0":"y", |
|
"15.0":"y", |
|
"16.0":"y", |
|
"17.0":"y", |
|
"18.0":"y", |
|
"19.0":"y", |
|
"20":"y", |
|
"21":"y", |
|
"22":"y", |
|
"23":"y", |
|
"24":"y", |
|
"25":"y", |
|
"26":"y", |
|
"27":"y", |
|
"28":"y", |
|
"29":"y" |
|
}, |
|
"and_qq":{ |
|
"14.9":"y" |
|
}, |
|
"baidu":{ |
|
"13.52":"y" |
|
}, |
|
"kaios":{ |
|
"2.5":"y", |
|
"3.0-3.1":"y" |
|
} |
|
}, |
|
"notes":"The timestamp is not actually high-resolution. To mitigate security threats such as Spectre, browsers currently round the result to varying degrees.", |
|
"notes_by_num":{ |
|
"1":"In Firefox 55-57, the `privacy.resistFingerprinting` preference can be enabled to change the precision to 100ms.", |
|
"2":"In Firefox, the `privacy.resistFingerprinting` preference can be enabled to change the precision to 100ms or the value of `privacy.resistFingerprinting.reduceTimerPrecision.microseconds`, whichever is larger.", |
|
"3":"In Firefox 58-59, the `privacy.reduceTimerPrecision` preference is enabled by default and defaults to 20us.", |
|
"4":"In Firefox, the `privacy.reduceTimerPrecision` preference is enabled by default and defaults to 2ms." |
|
}, |
|
"usage_perc_y":96.08, |
|
"usage_perc_a":0, |
|
"ucprefix":false, |
|
"parent":"", |
|
"keywords":"performance,now,testing", |
|
"chrome_id":"5349124069130240", |
|
"shown":true |
|
}
|
|
|