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<!doctype html>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<title>Test that a pending animation doesn't keep vsync running forever</title>
<body>
<script>
function ensureVsyncDisabled() {
let wu = SpecialPowers.wrap(window).windowUtils;
return new Promise(resolve => {
function check() {
if (wu.refreshDriverHasPendingTick) {
requestIdleCallback(check, {timeout:300});
} else {
resolve();
}
}
check();
})
}
promise_test(async function() {
await ensureVsyncDisabled();
let doc = new DOMParser().parseFromString("<div>", "text/html");
let anim = doc.querySelector("div").animate(null);
assert_true(anim.pending, "Animation should be pending");
anim.timeline = document.timeline;
await ensureVsyncDisabled();
assert_true(true, "Vsync should be disabled");
});
</script>
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