third_party/WebKit/LayoutTests/fast/animation/script-tests/request-animation-frame-prefix.js

   1 description("Tests the timestamps provided to prefixed webkitRequestAnimationFrame callbacks");
   2
   3 var firstTimestamp = undefined;
   4 var secondTimestamp = undefined;
   5 var legacyFirstTimestamp = undefined;
   6 var legacySecondTimestamp = undefined;
   7 var deltaError = undefined;
   8
   9 function busyWait(millis) {
  10     var start = Date.now();
  11     while (Date.now()-start < millis) {}
  12 }
  13
  14 window.requestAnimationFrame(function(timestamp) {
  15     firstTimestamp = timestamp;
  16 });
  17
  18 window.webkitRequestAnimationFrame(function(timestamp) {
  19     legacyFirstTimestamp = timestamp;
  20
  21     window.requestAnimationFrame(function(timestamp) {
  22         secondTimestamp = timestamp;
  23     });
  24
  25     window.webkitRequestAnimationFrame(function(timestamp) {
  26         legacySecondTimestamp = timestamp;
  27
  28         shouldBeGreaterThanOrEqual("legacyFirstTimestamp", "firstTimestamp");
  29         shouldBeGreaterThanOrEqual("legacySecondTimestamp", "secondTimestamp");
  30         deltaError = Math.abs((legacySecondTimestamp - legacyFirstTimestamp) - (secondTimestamp - firstTimestamp));
  31         shouldBeTrue("deltaError < 0.001");
  32         testRunner.notifyDone();
  33     });
  34
  35     busyWait(10);
  36 });
  37
  38 if (window.testRunner)
  39     testRunner.waitUntilDone();