blob: 6ace93ad54c2f6b173df060e39be097eca4b6867 [file] [log] [blame]
<!DOCTYPE html>
<title>Layout Instability: shift into viewport</title>
<link rel="help" href="https://wicg.github.io/layout-instability/" />
<style>
body { margin: 0; }
#j { position: relative; width: 600px; height: 200px; top: 600px; }
</style>
<div id='j'></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);
document.querySelector("#j").style.top = "400px";
// The element moves from outside the viewport to within the viewport, which
// should generate a shift.
// (width 600) * (height 0 + move 200)
const expectedScore = computeExpectedScore(600 * 200, 200);
await watcher.promise;
assert_equals(watcher.score, expectedScore);
}, "Shift into viewport.");
</script>