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diff --git a/testing/web-platform/tests/web-animations/timing-model/animations/current-time.html b/testing/web-platform/tests/web-animations/timing-model/animations/current-time.html
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+++ b/testing/web-platform/tests/web-animations/timing-model/animations/current-time.html
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+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>Tests for current time</title>
+<link rel="help" href="https://w3c.github.io/web-animations/#current-time">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="../../testcommon.js"></script>
+<body>
+<div id="log"></div>
+<script>
+'use strict';
+
+test(function(t) {
+  var animation =
+    new Animation(new KeyframeEffect(createDiv(t), null, 100 * MS_PER_SEC),
+                  document.timeline);
+
+  animation.play();
+  assert_equals(animation.currentTime, 0,
+    'Current time returns the hold time set when entering the play-pending ' +
+    'state');
+}, 'The current time returns the hold time when set');
+
+promise_test(function(t) {
+  var animation =
+    new Animation(new KeyframeEffect(createDiv(t), null, 100 * MS_PER_SEC),
+                  null);
+
+  return animation.ready.then(function() {
+    assert_equals(animation.currentTime, null);
+  });
+}, 'The current time is unresolved when there is no associated timeline ' +
+   '(and no hold time is set)');
+
+// FIXME: Test that the current time is unresolved when we have an inactive
+// timeline if we find a way of creating an inactive timeline!
+
+test(function(t) {
+  var animation =
+    new Animation(new KeyframeEffect(createDiv(t), null, 100 * MS_PER_SEC),
+                  document.timeline);
+
+  animation.startTime = null;
+  assert_equals(animation.currentTime, null);
+}, 'The current time is unresolved when the start time is unresolved ' +
+   '(and no hold time is set)');
+
+promise_test(function(t) {
+  var animation =
+    new Animation(new KeyframeEffect(createDiv(t), null, 100 * MS_PER_SEC),
+                  document.timeline);
+
+  animation.playbackRate = 2;
+  animation.startTime = document.timeline.currentTime - 25 * MS_PER_SEC;
+
+  var timelineTime = document.timeline.currentTime;
+  var startTime = animation.startTime;
+  var playbackRate = animation.playbackRate;
+  assert_times_equal(animation.currentTime,
+                     (timelineTime - startTime) * playbackRate,
+                     'Animation has a unresolved start time');
+}, 'The current time is calculated from the timeline time, start time and ' +
+   'playback rate');
+</script>
+</body>