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<!DOCTYPE html>
<html>
<head>
  <style>#point::after{content:"\30A"}</style>
</head>
<body>
  <h1>Ring Above on a (U+030A)</h1>
  <p>a with ring (hex): a&#x030A;</p>
  <p>a with ring (decimal): a&#778;</p>
  <p id=point>a with ring (CSS): a</p>
</body>
</html>

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HTML Entity for Ring Above (U+030A)