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| (Empty) |
| 1 <!DOCTYPE html> | |
| 2 <html> | |
| 3 <head> | |
| 4 <meta charset="utf-8" /> | |
| 5 <title>window.performance.now exists</title> | |
| 6 <link rel="author" title="W3C" href="http://www.w3.org/" /> | |
| 7 <link rel="help" href="http://www.w3.org/TR/hr-time/#sec-extenstions-performance
-interface"/> | |
| 8 <script src="../../../resources/testharness.js"></script> | |
| 9 <script src="../../../resources/testharnessreport.js"></script> | |
| 10 <script> | |
| 11 test(function() { | |
| 12 assert_equals(typeof window.performance, "object"); | |
| 13 }, "window.performance is defined", {assert: "The window.performance attribute p
rovides a hosting area for performance related attributes."}); | |
| 14 | |
| 15 test(function() { | |
| 16 assert_not_equals(window.performance.now, undefined, 'window.performance.now i
s defined'); | |
| 17 }, "High Resolution Time extension to the Performance interface", {assert: "wind
ow.performance.now exists"}); | |
| 18 | |
| 19 test(function() { | |
| 20 assert_equals(typeof window.performance.now, "function", "window.performance.n
ow is a function"); | |
| 21 }, "window.performance.now() function", {assert: "window.performance.now is a fu
nction"}); | |
| 22 | |
| 23 test(function() { | |
| 24 assert_equals(typeof window.performance.now(), "number", "window.performance.n
ow() returns a number"); | |
| 25 }, "window.performance.now() returns a number", {assert: "The now method MUST re
turn a DOMHighResTimeStamp"}); | |
| 26 | |
| 27 async_test(function() { | |
| 28 // Check whether the performance.now() method is close to Date() within 30ms (
due to inaccuracies) | |
| 29 var initial_hrt = performance.now(); | |
| 30 var initial_date = Date.now(); | |
| 31 setTimeout(this.step_func(function() { | |
| 32 var final_hrt = performance.now(); | |
| 33 var final_date = Date.now(); | |
| 34 assert_approx_equals(final_hrt - initial_hrt, final_date - initial_date, 30,
'High resolution time value increased by approximately the same amount as time
from date object'); | |
| 35 this.done(); | |
| 36 }), 2000); | |
| 37 }, 'High resolution time has approximately the right relative magnitude'); | |
| 38 </script> | |
| 39 </head> | |
| 40 <body> | |
| 41 <h1>Description</h1> | |
| 42 <p>This test validates that window.performance.now() exist and is a function.</p
> | |
| 43 | |
| 44 <div id="log"></div> | |
| 45 | |
| 46 </body> | |
| 47 </html> | |
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Chromium Code Reviews
Issue 1984023002:
Move web-platform-tests to wpt (part 1 of 2) (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@master