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<!DOCTYPE html>
<html>
<head>
  <style>#point::after{content:"\2236"}</style>
</head>
<body>
  <h1>Ratio (∶) in HTML</h1>
  <p>Hex: a &#x2236; b</p>
  <p>Decimal: a &#8758; b</p>
  <p>Named: a &ratio; b</p>
  <p>CSS: a <span id=point></span> b</p>
</body>
</html>

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HTML Entity for Ratio (∶)