test_offscreencanvas_sizechange.html

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<!DOCTYPE HTML>

<html>

<head>

<title>WebGL in OffscreenCanvas</title>

<script src="/tests/SimpleTest/SimpleTest.js"></script>

<link rel="stylesheet" href="/tests/SimpleTest/test.css">

</head>

<body>

<canvas id="c" width="64" height="64"></canvas>

<script>

SimpleTest.waitForExplicitFinish();

function runTest() {

  var htmlCanvas = document.getElementById("c");

  var worker = new Worker("offscreencanvas.js");

  worker.onmessage = function(evt) {

    var msg = evt.data || {};

    if (msg.type == "test") {

      ok(msg.result, msg.name);

    if (msg.type == "finish") {

      worker.terminate();

      SimpleTest.finish();

  var offscreenCanvas = htmlCanvas.transferControlToOffscreen();

  worker.postMessage({test: 'webgl_changesize', canvas: offscreenCanvas}, [offscreenCanvas]);

SpecialPowers.pushPrefEnv({'set': [

  ['webgl.force-enabled', true],

]}, runTest);

</script>

</body>

</html>