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chromium/third_party/blink/web_tests/external/wpt/html/canvas/offscreen/layers/2d.layer.restore-style.html 

<!DOCTYPE html>
<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
<link rel="match" href="2d.layer.restore-style-expected.html">
<meta name=fuzzy content="maxDifference=0-1; totalPixels=0-950">
<title>Canvas test: 2d.layer.restore-style</title>
<h1>2d.layer.restore-style</h1>
<p class="desc">Test that ensure layers restores style values upon endLayer.</p>
<canvas id="canvas" width="200" height="200">
  <p class="fallback">FAIL (fallback content)</p>
</canvas>
<script>
  const canvas = new OffscreenCanvas(200, 200);
  const ctx = canvas.getContext('2d');

  ctx.fillStyle = 'rgba(0,0,255,1)';
  ctx.fillRect(50, 50, 75, 50);
  ctx.globalAlpha = 0.5;

  ctx.beginLayer();
  ctx.fillStyle = 'rgba(225, 0, 0, 1)';
  ctx.fillRect(60, 60, 75, 50);
  ctx.endLayer();

  ctx.fillRect(70, 70, 75, 50);

  const outputCanvas = document.getElementById("canvas");
  outputCanvas.getContext('2d').drawImage(canvas, 0, 0);
</script>