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<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/html/canvas/resources/canvas-tests.js"></script>
<link rel="help" href="https://html.spec.whatwg.org/#dom-canvas-transfercontroltooffscreen">
<script>
test(function() {
var placeholder = document.createElement('canvas');
placeholder.width = 100;
placeholder.height = 50;
var offscreenCanvas = placeholder.transferControlToOffscreen();
assert_equals(offscreenCanvas.width, 100);
assert_equals(offscreenCanvas.height, 50);
}, "Test that an OffscreenCanvas generated by transferControlToOffscreen gets correct width and height");
test(function() {
var placeholder = document.createElement('canvas');
placeholder.width = 100;
placeholder.height = 50;
var offscreenCanvas = placeholder.transferControlToOffscreen();
assert_throws_dom("InvalidStateError", function() { placeholder.getContext('2d'); });
}, "Test that calling getContext on a placeholder canvas that has already transferred its control throws an exception");
test(function() {
var placeholder = document.createElement('canvas');
placeholder.width = 100;
placeholder.height = 50;
var offscreenCanvas = placeholder.transferControlToOffscreen();
assert_throws_dom("InvalidStateError", function() { placeholder.transferControlToOffscreen(); });
}, "Test that calling transferControlToOffscreen twice throws an exception");
</script>
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