wpt/css/css-sizing/dynamic-available-size-iframe.html at master · web-platform-tests/wpt · GitHub

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<!DOCTYPE html>
<html class=reftest-wait>
<meta name="assert" content="Checks that an absolute positioned element is positioned correctly, when the available size of its parent changes due to document resize." />
<link rel="help" href="https://crbug.com/928672">
<link rel="match" href="../reference/ref-filled-green-100px-square-only.html">
<script src="/common/reftest-wait.js"></script>
<p>Test passes if there is a filled green square.</p>
<iframe id="target" height="100" width="200" src="support/dynamic-available-size-iframe.html" style="border: none;"></iframe>
<script>
onload = () => {
  requestAnimationFrame(() => requestAnimationFrame(() => {
    target.width = '100';
    takeScreenshot();
  }));
};
</script>