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<script>
window.requestIdleCallback(function(){SpecialPowers.forceCC()});
var limit = 0;
function go() {
limit++; if(limit > 2) { return; }
var b = document.createElement("blockquote").attachShadow({mode: "open"});
b.innerHTML = a.innerHTML;
}
</script>
<data id="a">
<audio>
<source onerror="go()">
<link>