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<!doctype html>
<meta charset=utf-8>
<script src="../testcommon.js"></script>
<script src="/tests/SimpleTest/paint_listener.js"></script>
<style>
div {
/* Element needs geometry to be eligible for layerization */
width: 100px;
height: 100px;
background-color: white;
}
</style>
<body>
<script>
'use strict';
function waitForPaints() {
return new Promise(function(resolve, reject) {
waitForAllPaintsFlushed(resolve);
});
}
promise_test(async t => {
// This test only applies to compositor animations
if (!isOMTAEnabled()) {
return;
}
var div = addDiv(t, { style: 'transition: transform 50ms; ' +
'transform: translateX(0px)' });
getComputedStyle(div).transform;
div.style.transform = 'translateX(100px)';
var timeBeforeStart = window.performance.now();
await waitForPaints();
// If it took over 50ms to paint the transition, we have no luck
// to test it. This situation will happen if GC runs while waiting for the
// paint.
if (window.performance.now() - timeBeforeStart >= 50) {
return;
}
var transform =
SpecialPowers.DOMWindowUtils.getOMTAStyle(div, 'transform');
assert_not_equals(transform, '',
'The transition style is applied on the compositor');
// Generate artificial busyness on the main thread for 100ms.
var timeAtStart = window.performance.now();
while (window.performance.now() - timeAtStart < 100) {}
// Now the transition on the compositor should finish but stay at the final
// position because there was no chance to pull the transition back from
// the compositor.
transform =
SpecialPowers.DOMWindowUtils.getOMTAStyle(div, 'transform');
assert_equals(transform, 'matrix(1, 0, 0, 1, 100, 0)',
'The final transition style is still applied on the ' +
'compositor');
}, 'Transition on the compositor keeps the final style while the main thread ' +
'is busy even if the transition finished on the compositor');
done();
</script>
</body>
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