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<!DOCTYPE html>
<html>
<body>
<script type="text/javascript">
class XFoo extends HTMLElement {
constructor() {
super();
}
static get observedAttributes() {
return [3.76277868767527e-310, Symbol("Ashitaka"), {}];
}
attributeChangedCallback(aName, aOldValue, aNewValue) {
}
}
customElements.define('x-foo', XFoo);
</script>
</html>
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