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<!DOCTYPE HTML>
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<html>
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<body style="-moz-control-character-visibility:visible">
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<span id="s">foobar</span>
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<script>
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var x = s.getBoundingClientRect().width;
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document.body.setAttribute("style", "-moz-control-character-visibility:hidden");
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</script>
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</body>
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</html>
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