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<!doctype html>
<html>
<head>
<title>requestAnimationFrame must be triggered once</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<link rel="help" href="https://w3c.github.io/web-performance/specs/RequestAnimationFrame/Overview.html#dom-windowanimationtiming-requestanimationframe"/>
</head>
<body>
<div id="log"></div>
<script>
async_test(function (t) {
assert_false(document.hidden, "document.hidden must exist and be false to run this test properly");
window.requestAnimationFrame(t.step_func_done());
}, "requestAnimationFrame callback is invoked at least once before the timeout");
</script>
</body>
</html>
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