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