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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.drawImage</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.drawImage</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>
var t = async_test("Check that exceptions are thrown for operations that are malformed while layers are open.");
_addTest(function(canvas, ctx) {
const canvas2 = new OffscreenCanvas(200, 200);
const ctx2 = canvas2.getContext('2d');
// Shouldn't throw on its own.
ctx2.drawImage(canvas, 0, 0);
// Make sure the exception isn't caused by calling the function twice.
ctx2.drawImage(canvas, 0, 0);
// Calling again inside a layer should throw.
ctx.beginLayer();
assert_throws_dom("InvalidStateError",
() => ctx2.drawImage(canvas, 0, 0));
});
</script>
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