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<!DOCTYPE html>
<head>
<title>Optimization of requestAnimationFrame callbacks that don't modify the DOM shouldn't break animations</title>
<link rel="author" title="Mukilan Thiyagarajan" href="mailto:mukilan@igalia.com">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
</head>
<body>
<div id="target">0</div>
</body>
<script>
"use strict";
async_test(function(test) {
let frame = 0;
const draw = (t) => {
frame += 1;
if (frame < 11) {
// Don't mutate the DOM for 10 frames to meet the threshold for Servo's
// spurious frame optimization to kick in.
requestAnimationFrame(draw);
} else if (frame == 11) {
// Don't schedule next rAF so the compositor's tick is disabled.
// This is specific to Servo as the spurious frame detection at the
// time of this test was broken.
test.step_timeout(() => {
requestAnimationFrame(draw);
}, 0);
} else {
// Normal frames.
document.getElementById('target').innerText = t;
requestAnimationFrame(draw);
}
};
let target = document.getElementById('target');
test.step_timeout(test.step_func_done(() => {
assert_greater_than(parseInt(target.innerText), 500);
}), 550);
requestAnimationFrame(draw);
});
</script>
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