inline-flow-shift-one-line.html

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This test has a WPT meta file that expects 1 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /layout-instability/inline-flow-shift-one-line.html - WPT Dashboard Interop Dashboard

<!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>