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<!DOCTYPE html>
<html>
<head>
</head>
<body>
<textarea id="en-GB" lang="en-GB">element en-GB</textarea>
<textarea id="en-US" lang="testing-XX">element should default to en-US</textarea>
<div id="trouble-maker" contenteditable>the presence of this div triggers the faulty code path</div>
</body>
</html>