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<!doctype html>
<html>
<head>
<meta charset=utf-8>
<script>
Element.prototype.animate = function() {
throw 'Called animate() as defined in content document';
}
for (let name of ["KeyframeEffect", "Animation"]) {
this[name] = function() {
throw `Called overridden ${name} constructor`;
};
}
</script>
<body>
<div id="target"></div>
</body>
</html>