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HTML Code

<!DOCTYPE html>
<html>
<head>
  <style>#point::after{content:"\21D4"}</style>
</head>
<body>
  <h1>Left Right Double Arrow (U+21D4)</h1>
  <p>Arrow (hex): &#x21d4;</p>
  <p>Arrow (decimal): &#8660;</p>
  <p>Arrow (named): &hArr;</p>
  <p id=point>Arrow (CSS): </p>
</body>
</html>

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HTML Entity for Left Right Double Arrow (U+21D4)