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+<!DOCTYPE HTML>
+<html>
+<head>
+<title>OffscreenCanvas: Test neutering</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_neuter.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");
+
+ /* check html canvas is neuterd */
+ is(htmlCanvas.width, 64, "HTML canvas has correct width");
+ SimpleTest.doesThrow(
+ function() { htmlCanvas.width = 128; },
+ "Can't change html canvas' width after transferControlToOffscreen");
+
+ SimpleTest.doesThrow(
+ function() { htmlCanvas.height = 128; },
+ "Can't change html canvas' height after transferControlToOffscreen");
+
+ ok(!htmlCanvas.getContext("2d"), "Can't getContext after transferControlToOffscreen");
+ ok(!htmlCanvas.getContext("webgl"), "Can't getContext after transferControlToOffscreen");
+ ok(!htmlCanvas.getContext("webgl2"), "Can't getContext after transferControlToOffscreen");
+
+ worker.postMessage(offscreenCanvas, [offscreenCanvas]);
+
+ /* check parent offscreencanvas is neutered after being transfered */
+ SimpleTest.doesThrow(
+ function() { offscreenCanvas.width = 128; },
+ "Can't change transfered worker canvas width");
+
+ SimpleTest.doesThrow(
+ function() { offscreenCanvas.height = 128; },
+ "Can't change transfered worker canvas height");
+
+ SimpleTest.doesThrow(
+ function() { offscreenCanvas.getContext("2d") },
+ "Can't getContext on transfered worker canvas");
+
+ SimpleTest.doesThrow(
+ function() { offscreenCanvas.getContext("webgl") },
+ "Can't getContext on transfered worker canvas");
+
+ SimpleTest.doesThrow(
+ function() { offscreenCanvas.getContext("webgl2") },
+ "Can't getContext on transfered worker canvas");
+
+ // Transfer a neutered offscreencanvas should be ok.
+ worker.postMessage(offscreenCanvas, [offscreenCanvas]);
+
+ worker.terminate();
+ SimpleTest.finish();
+}
+
+SpecialPowers.pushPrefEnv({'set': [
+ ['gfx.offscreencanvas.enabled', true],
+ ['webgl.force-enabled', true],
+]}, runTest);
+
+</script>
+</body>
+</html>