File: size-change-under-backface-visibility-hidden.html

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<!doctype HTML>
<html class="reftest-wait">
  <title>CSS Test: Test for re-paint after resizing an element underneath a backface-visibility hidden element</title>
  <link rel="author" title="Chris Harrelson" href="mailto:chrishtr@chromium.org" />
  <link rel="help" href="https://drafts.csswg.org/css-transforms-2/#propdef-backface-visibility">
  <link rel="match" href="size-change-under-backface-visibility-hidden-ref.html">
  <script src="/common/reftest-wait.js"></script>
  Passes if it shows a green 200x200 square.
  <div style="will-change: transform; width: 300px; height: 0px">
    <div style="width: 1px; height: 1px; backface-visibility: hidden;">
      <div id=target style="width: 200px; height: 0px; position: relative; background: green; left: 10px;"></div>
    </div>
  </div>
  <script>
    onload = function() {
      requestAnimationFrame(() => requestAnimationFrame(() => {
        target.style.height = '200px';
        takeScreenshot();
      }));
    };
  </script>
</html>