Opal-Estate-Pro/node_modules/caniuse-db/features-json/high-resolution-time.json

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2019-09-13 06:27:52 +02:00
{
"title":"High Resolution Time API",
"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()`",
"spec":"https://www.w3.org/TR/hr-time/",
"status":"rec",
"links":[
{
"url":"https://developer.mozilla.org/en-US/docs/Web/API/Performance.now()",
"title":"MDN Web Docs - Performance.now"
},
{
"url":"http://updates.html5rocks.com/2012/08/When-milliseconds-are-not-enough-performance-now",
"title":"HTML5Rocks article"
},
{
"url":"https://www.sitepoint.com/discovering-the-high-resolution-time-api/",
"title":"SitePoint article"
},
{
"url":"http://aurelio.audero.it/demo/high-resolution-time-api-demo.html",
"title":"Demo"
}
],
"bugs":[
{
"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))."
},
{
"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)"
}
],
"categories":[
"JS API"
],
"stats":{
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},
"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, the \"privacy.reduceTimerPrecision\" preference is enabled by default and defaults to 20us in Firefox 59; in 60 it will be 2ms.",
"2":"In Firefox, the \"privacy.resistFingerprinting\" preference changes the precision to 100ms or the value of \"privacy.resistFingerprinting.reduceTimerPrecision.microseconds\", whichever is larger."
},
"usage_perc_y":96.4,
"usage_perc_a":0,
"ucprefix":false,
"parent":"",
"keywords":"performance,now,testing",
"ie_id":"highresolutiontime",
"chrome_id":"5349124069130240",
"firefox_id":"",
"webkit_id":"",
"shown":true
}