zyuas.com/node_modules/caniuse-db/features-json/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":"https://developer.chrome.com/blog/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":"https://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)"
    }
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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 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."
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  "parent":"",
  "keywords":"performance,now,testing",
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}