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