<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/common/canvas-tests.js"></script>
<link rel="help" href="https://html.spec.whatwg.org/#dom-offscreencanvas">
<script>

test(function() {
    let offscreenCanvas = new OffscreenCanvas(100, 100);
    let gl = offscreenCanvas.getContext("webgl");
    assert_true(gl instanceof WebGLRenderingContext);
    assert_equals(gl.canvas, offscreenCanvas);
}, "Test getContext('webgl').");

</script>