test_offscreencanvas_sharedworker.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 SharedWorker("offscreencanvas.js");

  ok(htmlCanvas, "Should have HTML canvas element");

  ok(worker, "Web worker successfully created");

  ok(htmlCanvas.transferControlToOffscreen, "HTMLCanvasElement has transferControlToOffscreen function");

  var offscreenCanvas = htmlCanvas.transferControlToOffscreen();

  ok(offscreenCanvas, "Expected transferControlToOffscreen to succeed");

  worker.port.start();

  // We don't support transferring OffscreenCanvas via shared worker.

  SimpleTest.doesThrow(

    function() {

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

},

    "OffscreenCanvas cannot transfer to shared worker"

);

  SimpleTest.finish();

SpecialPowers.pushPrefEnv({'set': [

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

]}, runTest);

</script>

</body>

</html>