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chromium/third_party/blink/web_tests/external/wpt/html/canvas/element/manual/layers/unclosed-nested-layers.html 

<!DOCTYPE html>
<link rel="match" href="unclosed-nested-layers-expected.html">
<title>Canvas test: unclosed-nested-layers</title>
<h1>unclosed-nested-layers</h1>
<p class="desc">Check that unclosed nested layers aren't rendered.</p>
<canvas id="canvas" width="200" height="200">
  <p class="fallback">FAIL (fallback content)</p>
</canvas>
<script>
  const canvas = document.getElementById("canvas");
  const ctx = canvas.getContext('2d');

  ctx.fillStyle = 'rgba(0, 0, 255, 1)';
  ctx.fillRect(60, 60, 75, 50);

  ctx.beginLayer();
  ctx.fillStyle = 'rgba(225, 0, 0, 1)';
  ctx.fillRect(50, 50, 75, 50);

  ctx.beginLayer();
  ctx.fillStyle = 'rgba(0, 255, 0, 1)';
  ctx.fillRect(70, 70, 75, 50);

  ctx.endLayer();
  // Missing ctx.endLayer() here.
</script>