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<!DOCTYPE html>
<meta charset="utf-8">
<script>
window.onmessage = m => {
navigator.mediaDevices.getUserMedia({video: true})
.then(() => 'ok')
.catch(e => e.name)
.then(r => {
window.parent.postMessage({
id: m.data.id,
result: r
}, '*');
});
}
</script>