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HTML Code

<!DOCTYPE html>
<html>
<head>
  <style>#letter::after{content:"\0058"}</style>
</head>
<body>
  <h1>Uppercase X (X)</h1>
  <p>Using Hex Code: &#x58;</p>
  <p>Using Decimal: &#88;</p>
  <p>Using Direct Character: X</p>
  <p id=letter>Using CSS Entity: </p>
  <p>Text: XML, X-ray, Xbox</p>
</body>
</html>

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HTML Entity for Uppercase X (X)