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<!DOCTYPE html>
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<html>
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<head>
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<style>
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#t:before { content: "a" }
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</style>
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</head>
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<body>
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<span id="t">
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<span style="display: table-cell">b</span>
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<script>document.body.offsetWidth</script>
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<span style="display: table-cell">c</span>
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d
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</span>
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</body>
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</html>
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