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<!DOCTYPE html>
<title>Layout Instability: shift inside a transformed container</title>
<link rel="help" href="https://wicg.github.io/layout-instability/" />
<style>
body { margin: 0; }
#container { transform: translateX(-300px) translateY(-40px); }
#shifter { position: relative; width: 600px; height: 140px; background: blue; }
</style>
<div id="container">
<div id="shifter"></div>
</div>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/util.js"></script>
<script>
promise_test(async () => {
const watcher = new ScoreWatcher;
// Wait for the initial render to complete.
await waitForAnimationFrames(2);
// Modify the position of the div.
document.querySelector("#shifter").style = "top: 60px";
// The shifter has size 600 x 140, but the container's transform
// reduces its viewport overlap.
const expectedScore = computeExpectedScore(
(600 - 300) * (140 - 40 + 60), 60);
await watcher.promise;
assert_equals(watcher.score, expectedScore);
}, 'Transformed container.');
</script>
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