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+<!doctype html>
+<meta charset=utf-8>
+<title>Web Animations API: DocumentTimeline tests</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="../testcommon.js"></script>
+<iframe srcdoc='<html><meta charset=utf-8></html>' width="10" height="10" id="iframe"></iframe>
+<iframe srcdoc='<html style="display:none"><meta charset=utf-8></html>' width="10" height="10" id="hidden-iframe"></iframe>
+<div id="log"></div>
+<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) {
+  const { AppConstants } = SpecialPowers.ChromeUtils.import(
+    "resource://gre/modules/AppConstants.jsm"
+  );
+
+  if (AppConstants.platform == "android") {
+    // Skip this test case on Android since it frequently fails on the
+    // environments. See bug 1761900.
+    t.done();
+  }
+
+  assert_greater_than_equal(document.timeline.currentTime, 0,
+    'document.timeline.currentTime is positive or zero');
+  // 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'
+});
+
+test(function() {
+  var hiddenIFrame = document.getElementById('hidden-iframe');
+  assert_equals(typeof hiddenIFrame.contentDocument.timeline.currentTime,
+    'number',
+    'currentTime of an initially hidden subframe\'s timeline is a number');
+  assert_true(hiddenIFrame.contentDocument.timeline.currentTime >= 0,
+    'currentTime of an initially hidden subframe\'s timeline is >= 0');
+}, 'document.timeline.currentTime hidden subframe test');
+
+async_test(function(t) {
+  var hiddenIFrame = document.getElementById('hidden-iframe');
+
+  // Don't run the test until after the iframe has completed loading or else the
+  // contentDocument may change.
+  var testToRunOnLoad = t.step_func(function() {
+    // Remove display:none
+    hiddenIFrame.style.display = 'block';
+    getComputedStyle(hiddenIFrame).display;
+
+    window.requestAnimationFrame(t.step_func(function() {
+      assert_greater_than(hiddenIFrame.contentDocument.timeline.currentTime, 0,
+        'document.timeline.currentTime is positive after removing'
+        + ' display:none');
+      var previousValue = hiddenIFrame.contentDocument.timeline.currentTime;
+
+      // Re-introduce display:none
+      hiddenIFrame.style.display = 'none';
+      getComputedStyle(hiddenIFrame).display;
+
+      window.requestAnimationFrame(t.step_func(function() {
+        assert_true(
+          hiddenIFrame.contentDocument.timeline.currentTime >= previousValue,
+          'document.timeline.currentTime does not go backwards after'
+          + ' re-setting display:none');
+        t.done();
+      }));
+    }));
+  });
+
+  if (hiddenIFrame.contentDocument.readyState === 'complete') {
+    testToRunOnLoad();
+  } else {
+    hiddenIFrame.addEventListener("load", testToRunOnLoad);
+  }
+}, 'document.timeline.currentTime hidden subframe dynamic test');
+
+</script>