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<!DOCTYPE html>
<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. -->
<title>Canvas test: 2d.layer.malformed-operations-with-promises.toBlob</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.malformed-operations-with-promises.toBlob</h1>
<p class="desc">Check that exceptions are thrown for operations that are malformed while layers are open.</p>
<p class="output">Actual output:</p>
<canvas id="c" class="output" width="200" height="200"><p class="fallback">FAIL (fallback content)</p></canvas>
<ul id="d"></ul>
<script>
promise_test(async t => {
var canvas = document.getElementById('c');
var ctx = canvas.getContext('2d');
// Shouldn't throw on its own.
await new Promise(resolve => canvas.toBlob(resolve));
// Make sure the exception isn't caused by calling the function twice.
await new Promise(resolve => canvas.toBlob(resolve));
// Calling again inside a layer should throw.
ctx.beginLayer();
await promise_rejects_dom(t, 'InvalidStateError', new Promise(resolve => canvas.toBlob(resolve)));
}, "Check that exceptions are thrown for operations that are malformed while layers are open.");
</script>
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