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<title>Web Animations API: DocumentTimeline tests</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="log"></div>
<iframe src="data:text/html;charset=utf-8," width="10" height="10" id="iframe"></iframe>
<script>
'use strict';

test(function() {
  assert_equals(document.timeline, document.timeline,
    'document.timeline returns the same object every time');
  var iframe = document.getElementById('iframe');
  assert_not_equals(document.timeline, iframe.contentDocument.timeline,
    'document.timeline returns a different object for each document');
  assert_not_equals(iframe.contentDocument.timeline, null,
    'document.timeline on an iframe is not null');
},
'document.timeline identity tests',
{
  help:   'http://dev.w3.org/fxtf/web-animations/#the-document-timeline',
  assert: [ 'Each document has a timeline called the document timeline' ],
  author: 'Brian Birtles'
});

async_test(function(t) {
  assert_true(document.timeline.currentTime > 0,
    'document.timeline.currentTime is positive');
  // document.timeline.currentTime should be set even before document
  // load fires. We expect this code to be run before document load and hence
  // the above assertion is sufficient.
  // If the following assertion fails, this test needs to be redesigned.
  assert_true(document.readyState !== 'complete',
    'Test is running prior to document load');

  // Test that the document timeline's current time is measured from
  // navigationStart.
  //
  // We can't just compare document.timeline.currentTime to
  // window.performance.now() because currentTime is only updated on a sample
  // so we use requestAnimationFrame instead.
  window.requestAnimationFrame(t.step_func(function(rafTime) {
    assert_equals(document.timeline.currentTime, rafTime,
                  'document.timeline.currentTime matches' +
                  ' requestAnimationFrame time');
    t.done();
  }));
},
'document.timeline.currentTime value tests',
{
  help: [
    'http://dev.w3.org/fxtf/web-animations/#the-global-clock',
    'http://dev.w3.org/fxtf/web-animations/#the-document-timeline'
  ],
  assert: [
    'The global clock is a source of monotonically increasing time values',
    'The time values of the document timeline are calculated as a fixed' +
    ' offset from the global clock',
    'the zero time corresponds to the navigationStart moment',
    'the time value of each document timeline must be equal to the time ' +
    'passed to animation frame request callbacks for that browsing context'
  ],
  author: 'Brian Birtles'
});

async_test(function(t) {
  var valueAtStart = document.timeline.currentTime;
  var timeAtStart = window.performance.now();
  while (window.performance.now() - timeAtStart < 100) {
    // Wait 100ms
  }
  assert_equals(document.timeline.currentTime, valueAtStart,
    'document.timeline.currentTime does not change within a script block');
  window.requestAnimationFrame(t.step_func(function() {
    assert_true(document.timeline.currentTime > valueAtStart,
      'document.timeline.currentTime increases between script blocks');
    t.done();
  }));
},
'document.timeline.currentTime liveness tests',
{
  help: 'http://dev.w3.org/fxtf/web-animations/#script-execution-and-live-updates-to-the-model',
  assert: [ 'The value returned by the currentTime attribute of a' +
            ' document timeline will not change within a script block' ],
  author: 'Brian Birtles'
});

</script>