move-distance-clamped.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/move-distance-clamped.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<title>Layout Instability: distance fraction not more than 1.0</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/test-adapter.js"></script>

<script src="resources/util.js"></script>

<style>

body { margin: 0; }

#shifter {

  position: relative;

  width: 100vw;

  height: 100vh;

  left: -2000vw;

  top: -2000vh;

  background: blue;

</style>

<div id="shifter"></div>

<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 = "left: 0; top: 0";

  const docElement = document.documentElement;

  const viewWidth = docElement.clientWidth;

  const viewHeight = docElement.clientHeight;

  // An element the size of the viewport has shifted by a huge distance, but

  // the move distance is effectively the viewport width or height (whichever

  // is larger) as the distance fraction is limited to a maximum of 1.0.

  const expectedScore = computeExpectedScore(

      viewWidth * viewHeight,

      Math.max(viewWidth, viewHeight));

  // Observer fires after the frame is painted.

  cls_expect(watcher, {score: 0});

  await watcher.promise;

  cls_expect(watcher, {score: expectedScore});

}, "Distance fraction not more than 1.0.");

</script>