File: offscreencanvas_serviceworker_inner.html

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<!DOCTYPE HTML>
<html>
<head>
<title>WebGL in OffscreenCanvas</title>
</head>
<body>
<canvas id="c" width="64" height="64"></canvas>
<script>
function ok(expect, msg) {
  parent.postMessage({type: "test", result: !!expect, name: msg}, "*");
}

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

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

var messageChannel = new MessageChannel();
messageChannel.port1.onmessage = function(evt) {
  parent.postMessage(evt.data, "*");
}

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

var offscreenCanvas = htmlCanvas.transferControlToOffscreen();
ok(offscreenCanvas, "Expected transferControlToOffscreen to succeed");

navigator.serviceWorker.ready.then(function() {
  navigator.serviceWorker.controller.postMessage({test: 'webgl', canvas: offscreenCanvas}, [offscreenCanvas, messageChannel.port2]);
});
</script>
</body>
</html>