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diff --git a/dom/animation/test/document-timeline/test_request_animation_frame.html b/dom/animation/test/document-timeline/test_request_animation_frame.html
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+++ b/dom/animation/test/document-timeline/test_request_animation_frame.html
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+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>Test RequestAnimationFrame Timestamps are monotonically increasing</title>
+<script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+<script>
+ var lastRequestAnimationFrameTimestamp = 0;
+ var requestAnimationFrameCount = 20;
+ var currentCount = 0;
+
+ // Test that all timestamps are always increasing
+ // and do not ever go backwards
+ function rafCallback(aTimestamp) {
+ SimpleTest.ok(aTimestamp > lastRequestAnimationFrameTimestamp,
+ "New RequestAnimationFrame timestamp should be later than the previous RequestAnimationFrame timestamp");
+ lastRequestAnimationFrameTimestamp = aTimestamp;
+ if (currentCount == requestAnimationFrameCount) {
+ SimpleTest.finish();
+ } else {
+ currentCount++;
+ window.requestAnimationFrame(rafCallback);
+ }
+ }
+
+ window.requestAnimationFrame(rafCallback);
+ SimpleTest.waitForExplicitFinish();
+</script>