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<!DOCTYPE html>
<title>Layout Instability: inline/text movement is detected</title>
<link rel="help" href="https://wicg.github.io/layout-instability/" />
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/util.js"></script>
<div style="width: 200px; font-size: 20px; line-height: 25px">
1AAAAAAA<br>
2AAAAAAA<br>
3AAAAAAA<br>
<div id="inline-block" style="display: inline-block">4AAAAAAA</div><br>
<div id="shift" style="display: inline-block"></div>5AAAAAAA<br>
6AAAAAAA<br>
7AAAAAAA<br>
</div>
<script>
promise_test(async () => {
const watcher = new ScoreWatcher;
// Wait for the initial render to complete.
await waitForAnimationFrames(2);
// Modify the width of |shift|.
document.querySelector("#shift").style.width = '50px';
// Only the line after |shift| is shifted right by 50px.
// The implementation may measure the real width of the shifted text
// or use the available width (i.e. width of the containing block).
// Also tolerate extra 10% error.
const text_width = document.querySelector("#inline-block").clientWidth;
const expectedScoreMin = computeExpectedScore((text_width + 50) * 20, 50) * 0.9;
const expectedScoreMax = computeExpectedScore(200 * 25, 50) * 1.1;
// Observer fires after the frame is painted.
assert_equals(watcher.score, 0);
await watcher.promise;
assert_between_exclusive(watcher.score, expectedScoreMin, expectedScoreMax);
}, 'Inline flow movement.');
</script>
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