383 lines
7.3 KiB
JSON
383 lines
7.3 KiB
JSON
{
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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":"http://updates.html5rocks.com/2012/08/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":"http://aurelio.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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"categories":[
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"JS API"
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],
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"stats":{
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},
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"firefox":{
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},
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"safari":{
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"3.1":"n",
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},
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"opera":{
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"9":"n",
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},
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"ios_saf":{
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},
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"op_mini":{
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"all":"n"
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},
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"android":{
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},
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"bb":{
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},
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"op_mob":{
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},
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"and_chr":{
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},
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"and_ff":{
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"68":"y"
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},
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"ie_mob":{
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},
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"and_uc":{
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"12.12":"y"
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},
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"samsung":{
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"4":"y",
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"5.0-5.4":"y",
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"6.2-6.4":"y",
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"8.2":"y",
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},
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"and_qq":{
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"1.2":"y"
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},
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"baidu":{
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"7.12":"y"
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},
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"kaios":{
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"2.5":"y"
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}
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},
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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.",
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"notes_by_num":{
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"1":"In Firefox, the \"privacy.reduceTimerPrecision\" preference is enabled by default and defaults to 20us in Firefox 59; in 60 it will be 2ms.",
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"2":"In Firefox, the \"privacy.resistFingerprinting\" preference changes the precision to 100ms or the value of \"privacy.resistFingerprinting.reduceTimerPrecision.microseconds\", whichever is larger."
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},
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"usage_perc_y":96.4,
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"usage_perc_a":0,
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"ucprefix":false,
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"parent":"",
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"keywords":"performance,now,testing",
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"ie_id":"highresolutiontime",
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"chrome_id":"5349124069130240",
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"firefox_id":"",
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"webkit_id":"",
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"shown":true
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}
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