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+<!DOCTYPE html>
+<html>
+<head>
+  <title>
+    Test for animation.effect.updateTiming({ endDelay }) on compositor
+    animations
+  </title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script src="/tests/SimpleTest/paint_listener.js"></script>
+  <script type="application/javascript" src="animation_utils.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css">
+  <style type="text/css">
+    .target {
+      /* The animation target needs geometry in order to qualify for OMTA */
+      width: 100px;
+      height: 100px;
+      background-color: white;
+    }
+  </style>
+</head>
+<body>
+<div id="display"></div>
+<script type="application/javascript">
+"use strict";
+
+SimpleTest.waitForExplicitFinish();
+
+runOMTATest(function() {
+  runAllAsyncAnimTests().then(SimpleTest.finish);
+}, SimpleTest.finish, SpecialPowers);
+
+addAsyncAnimTest(async function() {
+  var [ div ] = new_div("");
+  var animation = div.animate(
+    [ { transform: 'translate(0px)' }, { transform: 'translate(100px)' } ],
+    { duration: 1000, fill: 'none' });
+  await waitForPaints();
+
+  advance_clock(100);
+  omta_is(div, "transform", { tx: 10 }, RunningOn.Compositor,
+          "Animation is running on compositor");
+  animation.effect.updateTiming({ endDelay: 1000 });
+
+  await waitForPaints();
+  omta_is(div, "transform", { tx: 10 }, RunningOn.Compositor,
+          "Animation remains on compositor when endDelay is changed");
+
+  advance_clock(1000);
+  await waitForPaints();
+  omta_is(div, "transform", { tx: 0 }, RunningOn.MainThread,
+          "Animation is updated on main thread");
+
+  done_div();
+});
+
+addAsyncAnimTest(async function() {
+  var [ div ] = new_div("");
+  var animation = div.animate(
+    [ { transform: 'translate(0px)' }, { transform: 'translate(100px)' } ],
+    { duration: 1000, endDelay: -500, fill: 'none' });
+  await waitForPaints();
+
+  advance_clock(400);
+  await waitForPaints();
+  omta_is(div, "transform", { tx: 40 }, RunningOn.Compositor,
+          "Animation is updated on compositor " +
+          "duration 1000, endDelay -500, fill none, current time 400");
+
+  advance_clock(100);
+  await waitForPaints();
+  omta_is(div, "transform", { tx: 0 }, RunningOn.MainThread,
+          "Animation is updated on main thread " +
+          "duration 1000, endDelay -500, fill none, current time 500");
+
+  advance_clock(400);
+  await waitForPaints();
+  omta_is(div, "transform", { tx: 0 }, RunningOn.MainThread,
+          "Animation is updated on main thread " +
+          "duration 1000, endDelay -500, fill none, current time 900");
+
+  advance_clock(100);
+  await waitForPaints();
+  omta_is(div, "transform", { tx: 0 }, RunningOn.MainThread,
+          "Animation is updated on main thread " +
+          "duration 1000, endDelay -500, fill none, current time 1000");
+
+  done_div();
+});
+
+addAsyncAnimTest(async function() {
+  var [ div ] = new_div("");
+  var animation = div.animate(
+    [ { transform: 'translate(0px)' }, { transform: 'translate(100px)' } ],
+    { duration: 1000, endDelay: 1000, fill: 'forwards' });
+  await waitForPaints();
+
+  advance_clock(1500);
+  await waitForPaints();
+  omta_is(div, "transform", { tx: 100 }, RunningOn.Compositor,
+          "The end delay is performed on the compositor thread");
+
+  done_div();
+});
+
+addAsyncAnimTest(async function() {
+  var [ div ] = new_div("");
+  var animation = div.animate(
+    [ { transform: 'translate(0px)' }, { transform: 'translate(100px)' } ],
+    { duration: 1000, endDelay: -500, fill: 'forwards' });
+  await waitForPaints();
+
+  advance_clock(400);
+  await waitForPaints();
+  omta_is(div, "transform", { tx: 40 }, RunningOn.Compositor,
+          "Animation is updated on compositor " +
+          "duration 1000, endDelay -500, fill forwards, current time 400");
+
+  advance_clock(100);
+  await waitForPaints();
+  omta_is(div, "transform", { tx: 50 }, RunningOn.MainThread,
+          "Animation is updated on main thread " +
+          "duration 1000, endDelay -500, fill forwards, current time 500");
+
+  advance_clock(400);
+  await waitForPaints();
+  omta_is(div, "transform", { tx: 50 }, RunningOn.MainThread,
+          "Animation is updated on main thread " +
+          "duration 1000, endDelay -500, fill forwards, current time 900");
+
+  advance_clock(100);
+  await waitForPaints();
+  omta_is(div, "transform", { tx: 50 }, RunningOn.MainThread,
+          "Animation is updated on main thread " +
+          "duration 1000, endDelay -500, fill forwards, current time 1000");
+
+  done_div();
+});
+
+</script>
+</body>
+</html>