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<!DOCTYPE html>
<html>
<head>
<script>
var audioInternalEventHandler;
function go() {
let video = document.querySelector('audio');
audio.src = 'video-with-audio.mp4';
audio.play();
}
function postEventToMessageHandler(event) {
window.webkit.messageHandlers[event.type].postMessage(event.detail);
}
window.addEventListener('load', event => {
let audio = document.querySelector('audio');
if (!window.internals)
return;
audioInternalEventHandler = internals.addInternalEventTarget(audio);
audioInternalEventHandler.addEventListener('media-player-spatial-experience-change', postEventToMessageHandler);
});
</script>
</head>
<body onload="go()">
<audio></audio>
</body>
</html>
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