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#point:after{
content:"\0014C";
}
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<p>Uppercase O Macron using Hexa Decimal: Ō</p>
<p>Uppercase O Macron using HTML Code: Ō</p>
<p>Uppercase O Macron using HTML Entity: Ō</p>
<p id="point">Uppercase O Macron using CSS Entity: </p>
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