File: paint-containment-001.html

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<!DOCTYPE html>
<html class="reftest-wait">
  <title>Resize multicol with paint-contained child, without affecting layout, apart from column offsets</title>
  <link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
  <link rel="help" href="https://issues.chromium.org/issues/40596162">
  <link rel="match" href="../reference/ref-filled-green-100px-square.xht">
  <p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
  <div id="container" style="columns:2; gap:0; width:500px; column-fill:auto; height:100px; background:red;">
    <div style="contain:paint; width:50px; height:200px;">
      <div style="position:relative;">
        <div style="height:150px; background:green;"></div>
      </div>
      <div style="position:relative;">
        <div style="height:50px; background:green;"></div>
      </div>
    </div>
  </div>
  <script>
    requestAnimationFrame(()=> {
      requestAnimationFrame(()=> {
        container.style.width = "100px";
        document.documentElement.classList.remove("reftest-wait");
      });
    });
  </script>
</html>