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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.getImageData</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.getImageData</h1>
<p class="desc">Check that exceptions are thrown for operations that are malformed while layers are open.</p>
<script>
var t = async_test("Check that exceptions are thrown for operations that are malformed while layers are open.");
var t_pass = t.done.bind(t);
var t_fail = t.step_func(function(reason) {
throw reason;
});
t.step(function() {
var canvas = new OffscreenCanvas(200, 200);
var ctx = canvas.getContext('2d');
// Shouldn't throw on its own.
ctx.getImageData(0, 0, 200, 200);
// Make sure the exception isn't caused by calling the function twice.
ctx.getImageData(0, 0, 200, 200);
// Calling again inside a layer should throw.
ctx.beginLayer();
assert_throws_dom("InvalidStateError",
() => ctx.getImageData(0, 0, 200, 200));
t.done();
});
</script>
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