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+{
+  "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"
+    },
+    "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",
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+      "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"
+    },
+    "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",
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+      "53":"y",
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+      "57":"y",
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+      "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"
+    },
+    "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",
+      "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",
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+      "17":"y",
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+      "21":"y",
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+      "30":"y",
+      "31":"y",
+      "32":"y",
+      "33":"y",
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+      "35":"y",
+      "36":"y",
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+      "40":"y",
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+      "45":"y",
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+      "49":"y",
+      "50":"y",
+      "51":"y",
+      "52":"y",
+      "53":"y",
+      "54":"y",
+      "55":"y",
+      "56":"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":"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",
+      "67":"y"
+    },
+    "bb":{
+      "7":"n",
+      "10":"y"
+    },
+    "op_mob":{
+      "10":"n",
+      "11":"n",
+      "11.1":"n",
+      "11.5":"n",
+      "12":"n",
+      "12.1":"n",
+      "46":"y"
+    },
+    "and_chr":{
+      "69":"y"
+    },
+    "and_ff":{
+      "62":"y"
+    },
+    "ie_mob":{
+      "10":"y",
+      "11":"y"
+    },
+    "and_uc":{
+      "11.8":"y"
+    },
+    "samsung":{
+      "4":"y",
+      "5":"y",
+      "6.2":"y",
+      "7.2":"y"
+    },
+    "and_qq":{
+      "1.2":"y"
+    },
+    "baidu":{
+      "7.12":"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":92.81,
+  "usage_perc_a":0,
+  "ucprefix":false,
+  "parent":"",
+  "keywords":"performance,now,testing",
+  "ie_id":"highresolutiontime",
+  "chrome_id":"5349124069130240",
+  "firefox_id":"",
+  "webkit_id":"",
+  "shown":true
+}