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<!DOCTYPE html>
<html>
<head>
<script>
window.addEventListener('load', async event => {
let context = new AudioContext();
let node = context.createBufferSource();
node.connect(context.destination);
let audio = new Audio();
audio.src = "video-with-audio.mp4";
Promise.all([context.resume(), audio.play()]).then(() => {
window.webkit.messageHandlers.testHandler.postMessage('playing');
}, () => {
window.webkit.messageHandlers.testHandler.postMessage('not playing');
});
});
</script>
</head>
</html>
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