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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-offscreencanvas">
<script>
test(function() {
assert_throws_js(
TypeError,
() => OffscreenCanvas(100, 50),
"Calling OffscreenCanvas constructor without 'new' must throw"
);
}, "OffscreenCanvas constructor called as normal function");
test(function() {
var offscreenCanvas = new OffscreenCanvas(100, 50);
assert_equals(offscreenCanvas.width, 100);
assert_equals(offscreenCanvas.height, 50);
offscreenCanvas.width = 50;
offscreenCanvas.height = 100;
assert_equals(offscreenCanvas.width, 50);
assert_equals(offscreenCanvas.height, 100);
}, "Test that calling OffscreenCanvas's constructor generates correct width and height.");
test(function() {
var offscreenCanvas1 = new OffscreenCanvas(1, 1);
offscreenCanvas1.width = null;
offscreenCanvas1.height = null;
assert_equals(offscreenCanvas1.width, 0);
assert_equals(offscreenCanvas1.height, 0);
assert_throws_js(TypeError, function() { new OffscreenCanvas(-1, -1); });
var offscreenCanvas2 = new OffscreenCanvas(null, null);
assert_equals(offscreenCanvas2.width, 0);
assert_equals(offscreenCanvas2.height, 0);
assert_throws_js(TypeError, function() { offscreenCanvas2.width = -1; });
assert_throws_js(TypeError, function() { offscreenCanvas2.height = -1; });
var obj = {Name: "John Doe", Age: 30};
assert_throws_js(TypeError, function() { offscreenCanvas2.width = obj; });
assert_throws_js(TypeError, function() { offscreenCanvas2.height = obj; });
assert_throws_js(TypeError, function() { new OffscreenCanvas(obj, obj); });
}, "Test that OffscreenCanvas constructor handles invalid arguments correctly");
</script>
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