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<!DOCTYPE html>
<html>
<head>
  <style>#point::after{content:"\27FA"}</style>
</head>
<body>
  <h1>Long Left Right Double Arrow (⟺) in HTML</h1>
  <p>Using Hex Code: &#x27FA;</p>
  <p>Using Decimal: &#10234;</p>
  <p>Using Named Entity: &xhArr;</p>
  <p id=point>Using CSS Entity: </p>
  <p>Logic: A ⟺ B (iff)</p>
</body>
</html>

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HTML Entity for Long Left Right Double Arrow (⟺)