Edit File: high-resolution-time.json
{ "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":{ "ie":{ "5.5":"n", "6":"n", "7":"n", "8":"n", "9":"n", "10":"y", "11":"y" }, "edge":{ "12":"y", "13":"y", "14":"y", "15":"y", "16":"y", "17":"y", "18":"y", "79":"y", "80":"y", "81":"y", "83":"y", "84":"y", "85":"y", "86":"y", "87":"y", "88":"y", "89":"y", "90":"y", "91":"y", "92":"y", "93":"y", "94":"y", "95":"y", "96":"y" }, "firefox":{ "2":"n", "3":"n", "3.5":"n", "3.6":"n", "4":"n", "5":"n", "6":"n", "7":"n", "8":"n", "9":"n", "10":"n", "11":"n", "12":"n", "13":"n", "14":"n", "15":"y", "16":"y", "17":"y", "18":"y", "19":"y", "20":"y", "21":"y", "22":"y", "23":"y", "24":"y", "25":"y", "26":"y", "27":"y", "28":"y", "29":"y", "30":"y", "31":"y", "32":"y", "33":"y", "34":"y", "35":"y", "36":"y", "37":"y", "38":"y", "39":"y", "40":"y", "41":"y", "42":"y", "43":"y", "44":"y", "45":"y", "46":"y", "47":"y", "48":"y", "49":"y", "50":"y", "51":"y", "52":"y", "53":"y", "54":"y", "55":"y", "56":"y", "57":"y", "58":"y", "59":"y", "60":"y", "61":"y", "62":"y", "63":"y", "64":"y", "65":"y", "66":"y", "67":"y", "68":"y", "69":"y", "70":"y", "71":"y", "72":"y", "73":"y", "74":"y", "75":"y", "76":"y", "77":"y", "78":"y", "79":"y", "80":"y", "81":"y", "82":"y", "83":"y", "84":"y", "85":"y", "86":"y", "87":"y", "88":"y", "89":"y", "90":"y", "91":"y", "92":"y", "93":"y", "94":"y", "95":"y", "96":"y", "97":"y" }, "chrome":{ "4":"n", "5":"n", "6":"n", "7":"n", "8":"n", "9":"n", "10":"n", "11":"n", "12":"n", "13":"n", "14":"n", "15":"n", "16":"n", "17":"n", "18":"n", "19":"n", "20":"y x", "21":"y x", "22":"y x", "23":"y x", "24":"y", "25":"y", "26":"y", "27":"y", "28":"y", "29":"y", "30":"y", "31":"y", "32":"y", "33":"y", "34":"y", "35":"y", "36":"y", "37":"y", "38":"y", "39":"y", "40":"y", "41":"y", "42":"y", "43":"y", "44":"y", "45":"y", "46":"y", "47":"y", "48":"y", "49":"y", "50":"y", "51":"y", "52":"y", "53":"y", "54":"y", "55":"y", "56":"y", "57":"y", "58":"y", "59":"y", "60":"y", "61":"y", "62":"y", "63":"y", "64":"y", "65":"y", "66":"y", "67":"y", "68":"y", "69":"y", "70":"y", "71":"y", "72":"y", "73":"y", "74":"y", "75":"y", "76":"y", "77":"y", "78":"y", "79":"y", "80":"y", "81":"y", "83":"y", "84":"y", "85":"y", "86":"y", "87":"y", "88":"y", "89":"y", "90":"y", "91":"y", "92":"y", "93":"y", "94":"y", "95":"y", "96":"y", "97":"y", "98":"y", "99":"y" }, "safari":{ "3.1":"n", "3.2":"n", "4":"n", "5":"n", "5.1":"n", "6":"n", "6.1":"n", "7":"n", "7.1":"n", "8":"y", "9":"y", "9.1":"y", "10":"y", "10.1":"y", "11":"y", "11.1":"y", "12":"y", "12.1":"y", "13":"y", "13.1":"y", "14":"y", "14.1":"y", "15":"y", "15.1":"y", "15.2":"y", "TP":"y" }, "opera":{ "9":"n", "9.5-9.6":"n", "10.0-10.1":"n", "10.5":"n", "10.6":"n", "11":"n", "11.1":"n", "11.5":"n", "11.6":"n", "12":"n", "12.1":"n", "15":"y", "16":"y", "17":"y", "18":"y", "19":"y", "20":"y", "21":"y", "22":"y", "23":"y", "24":"y", "25":"y", "26":"y", "27":"y", "28":"y", "29":"y", "30":"y", "31":"y", "32":"y", "33":"y", "34":"y", "35":"y", "36":"y", "37":"y", "38":"y", "39":"y", "40":"y", "41":"y", "42":"y", "43":"y", "44":"y", "45":"y", "46":"y", "47":"y", "48":"y", "49":"y", "50":"y", "51":"y", "52":"y", "53":"y", "54":"y", "55":"y", "56":"y", "57":"y", "58":"y", "60":"y", "62":"y", "63":"y", "64":"y", "65":"y", "66":"y", "67":"y", "68":"y", "69":"y", "70":"y", "71":"y", "72":"y", "73":"y", "74":"y", "75":"y", "76":"y", "77":"y", "78":"y", "79":"y", "80":"y", "81":"y", "82":"y" }, "ios_saf":{ "3.2":"n", "4.0-4.1":"n", "4.2-4.3":"n", "5.0-5.1":"n", "6.0-6.1":"n", "7.0-7.1":"n", "8":"y", "8.1-8.4":"n", "9.0-9.2":"y", "9.3":"y", "10.0-10.2":"y", "10.3":"y", "11.0-11.2":"y", "11.3-11.4":"y", "12.0-12.1":"y", "12.2-12.5":"y", "13.0-13.1":"y", "13.2":"y", "13.3":"y", "13.4-13.7":"y", "14.0-14.4":"y", "14.5-14.8":"y", "15.0-15.1":"y", "15.2":"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", "96":"y" }, "bb":{ "7":"n", "10":"y" }, "op_mob":{ "10":"n", "11":"n", "11.1":"n", "11.5":"n", "12":"n", "12.1":"n", "64":"y" }, "and_chr":{ "96":"y" }, "and_ff":{ "94":"y" }, "ie_mob":{ "10":"y", "11":"y" }, "and_uc":{ "12.12":"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" }, "and_qq":{ "10.4":"y" }, "baidu":{ "7.12":"y" }, "kaios":{ "2.5":"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, 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":98.1, "usage_perc_a":0, "ucprefix":false, "parent":"", "keywords":"performance,now,testing", "ie_id":"highresolutiontime", "chrome_id":"5349124069130240", "firefox_id":"", "webkit_id":"", "shown":true }
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