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

<!DOCTYPE html>
<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
<link rel="match" href="2d.layer.cross-layer-paths-expected.html">
<title>Canvas test: 2d.layer.cross-layer-paths</title>
<h1>2d.layer.cross-layer-paths</h1>
<p class="desc">Checks that path defined in a layer is usable outside.</p>
<canvas id="canvas" width="100" height="50">
  <p class="fallback">FAIL (fallback content)</p>
</canvas>
<script>
  const canvas = new OffscreenCanvas(100, 50);
  const ctx = canvas.getContext('2d');

  ctx.beginLayer();
  ctx.translate(50, 0);
  ctx.moveTo(0, 0);
  ctx.endLayer();
  ctx.lineTo(50, 100);
  ctx.stroke();

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