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chromium/third_party/blink/web_tests/external/wpt/html/canvas/offscreen/layers/2d.layer.exceptions-are-no-op.html 

<!DOCTYPE html>
<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
<title>OffscreenCanvas test: 2d.layer.exceptions-are-no-op</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/html/canvas/resources/canvas-tests.js"></script>

<h1>2d.layer.exceptions-are-no-op</h1>
<p class="desc">Checks that the context state is left unchanged if beginLayer throws.</p>


<script>
test(t => {
  var canvas = new OffscreenCanvas(100, 50);
  var ctx = canvas.getContext('2d');

  // Get `beginLayer` to throw while parsing the filter.
  assert_throws_js(TypeError,
                   () => ctx.beginLayer({filter: {name: 'colorMatrix',
                                                  values: 'foo'}}));
  // `beginLayer` shouldn't have opened the layer, so `endLayer` should throw.
  assert_throws_dom("InvalidStateError", () => ctx.endLayer());

}, "Checks that the context state is left unchanged if beginLayer throws.");
</script>