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diff --git a/testing/web-platform/tests/web-animations/interfaces/Animation/play.html b/testing/web-platform/tests/web-animations/interfaces/Animation/play.html
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+++ b/testing/web-platform/tests/web-animations/interfaces/Animation/play.html
@@ -0,0 +1,34 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>Animation.play</title>
+<link rel="help" href="https://drafts.csswg.org/web-animations/#dom-animation-play">
+<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';
+
+promise_test(t => {
+  const div = createDiv(t);
+  const animation = div.animate({ transform: ['none', 'translate(10px)']},
+                                { duration: 100 * MS_PER_SEC,
+                                  iterations: Infinity });
+  return animation.ready.then(() => {
+    // Seek to a time outside the active range so that play() will have to
+    // snap back to the start
+    animation.currentTime = -5 * MS_PER_SEC;
+    animation.playbackRate = -1;
+
+    assert_throws_dom('InvalidStateError',
+                      () => { animation.play(); },
+                      'Expected InvalidStateError exception on calling play() ' +
+                      'with a negative playbackRate and infinite-duration ' +
+                  'animation');
+  });
+}, 'play() throws when seeking an infinite-duration animation played in ' +
+   'reverse');
+
+</script>
+</body>