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<!DOCTYPE html>
<html class="reftest-wait">
<head>
<script>
function boom()
{
var a = new AudioContext();
var b = new BroadcastChannel("x");
a.addEventListener("statechange", bye, false);
}
function bye()
{
document.documentElement.removeAttribute("class");
}
</script>
</head>
<body onload="boom();"></body>
</html>