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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="UTF-8">
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<script>
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function boom()
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{
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document.documentElement.offsetHeight;
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document.getElementById("g").firstChild.remove();
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}
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</script>
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</head>
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<body onload="boom();">
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<div style="display: grid;" id="g">a b<br></div>
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</body>
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</html>
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