2d.layer.exceptions-are-no-op.html

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This test has a WPT meta file that expects 1 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /html/canvas/offscreen/layers/2d.layer.exceptions-are-no-op.html - WPT Dashboard Interop Dashboard

<!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>