File: clip-negative-bottom-margin.html

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<!DOCTYPE html>
<title>Layout Instability: clip with negative bottom margin</title>
<link rel="help" href="https://wicg.github.io/layout-instability/" />
<style>

#scroller { overflow: scroll; width: 200px; height: 500px; }
#space { height: 1000px; margin-bottom: -500px; }
#j { width: 150px; height: 150px; background: yellow; }

</style>
<div id='scroller'>
  <div id='space'></div>
  <div id='j'></div>
</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);

  // Increase j's top margin by 100px. Since j is fully clipped by the scroller,
  // this should not generate a shift.
  document.querySelector("#j").style.marginTop = "100px";

  await waitForAnimationFrames(3);
  assert_equals(watcher.score, 0);
}, "Clip with negative bottom margin.");

</script>