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<!DOCTYPE html>
<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
<meta charset="UTF-8">
<title>Canvas test: 2d.layer.exceptions-are-no-op.tentative</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/html/canvas/resources/canvas-tests.js"></script>
<link rel="stylesheet" href="/html/canvas/resources/canvas-tests.css">
<body class="show_output">
<h1>2d.layer.exceptions-are-no-op.tentative</h1>
<p class="desc">Checks that the context state is left unchanged if beginLayer throws.</p>
<p class="output">Actual output:</p>
<canvas id="c" class="output" width="100" height="50"><p class="fallback">FAIL (fallback content)</p></canvas>
<ul id="d"></ul>
<script>
test(t => {
var canvas = document.getElementById('c');
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>
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