shift-into-viewport.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/shift-into-viewport.html - WPT Dashboard Interop Dashboard

<!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: absolute; width: 600px; height: 200px; top: 100%; background: blue; }

</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);

  // Move div partially into viewport.

  document.querySelector("#j").style.top =

      document.documentElement.clientHeight - 200 + "px";

  // 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>