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<!DOCTYPE HTML>
<html>
<head>
<title>Test that opacity animation is correctly placed during asynchronous scrolling</title>
<script src="apz_test_utils.js"></script>
<script src="/tests/SimpleTest/paint_listener.js"></script>
<meta name="viewport" content="width=device-width"/>
<style>
#anim {
background: green;
width: 100px;
height: 100px;
animation: anim 100s step-start;
}
@keyframes anim {
from { opacity: 0; }
to { opacity: 1; }
}
</style>
</head>
<body>
<!--
This height should be smaller than window height, otherwise the animation
followed by this element will be out of view, thus the animation doesn't run
on the compositor.
-->
<div style="height: 500px"></div>
<div id="anim"></div>
<!--
Give the page room to scroll, so that the setAsyncScrollOffset() call
doesn't take the scroll position out of bounds
-->
<div style="height: 1000px"></div>
</body>
<script>
"use strict";
const utils = SpecialPowers.getDOMWindowUtils(window);
async function test_opacity() {
utils.setDisplayPortForElement(0, 0, 300, 1000, document.documentElement, 1);
await promiseAllPaintsDone();
let dpr = window.devicePixelRatio;
let transform = parseTransform(utils.getOMTCTransform(anim));
isTransformClose(transform, [1, 0, 0, 1, 0, 0],
"The element shouldn't be moved before scrolling");
utils.setAsyncScrollOffset(document.documentElement, 0, 300);
await new Promise(resolve => waitForApzFlushedRepaints(resolve));
transform = parseTransform(utils.getOMTCTransform(anim));
isTransformClose(transform, [1, 0, 0, 1, 0, -300 * dpr],
"Element should have been moved by the offset");
}
if (utils.layerManagerType == "WebRender") {
ok(true, "This test doesn't need to run on WebRender");
subtestDone();
} else {
waitUntilApzStable().then(test_opacity).then(subtestDone, subtestFailed);
}
</script>
</html>
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