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https://github.com/web-platform-tests/wpt
26 December 2018, 22:31:15 UTC
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Tip revision: abe917f7bffefea2cadd1c3c501d50339f5c2d9c authored by Hallvord R. M. Steen on 12 October 2015, 12:04:22 UTC
Removing some 'popups must be enabled' messages
Tip revision: abe917f
basic.html 
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>window.performance.now exists</title>
<link rel="author" title="W3C" href="http://www.w3.org/" />
<link rel="help" href="http://www.w3.org/TR/hr-time/#sec-extenstions-performance-interface"/>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<link rel="stylesheet" href="/resources/testharness.css" />
<script>
test(function() {
  assert_equals(typeof window.performance, "object");
}, "window.performance is defined", {assert: "The window.performance attribute provides a hosting area for performance related attributes."});

test(function() {
  assert_not_equals(window.performance.now, undefined, 'window.performance.now is defined'); 
}, "High Resolution Time extension to the Performance interface", {assert: "window.performance.now exists"});

test(function() {
  assert_equals(typeof window.performance.now, "function", "window.performance.now is a function");
}, "window.performance.now() function", {assert: "window.performance.now is a function"});

test(function() {
  assert_equals(typeof window.performance.now(), "number", "window.performance.now() returns a number");
}, "window.performance.now() returns a number", {assert: "The now method MUST return a DOMHighResTimeStamp"});
</script>
</head>
<body>
<h1>Description</h1>
<p>This test validates that window.performance.now() exist and is a function.</p>

<div id="log"></div>

</body>
</html>
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