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HTML Code

<!DOCTYPE html>
<html lang=vi>
<head>
  <meta charset=utf-8>
  <style>#point::after{content:"\0309"}</style>
</head>
<body>
  <h1>Hook Above (U+0309)</h1>
  <p>Combining mark alone: &#x0309;</p>
  <p>Using Hex: a&#x0309;</p>
  <p>Using Decimal: a&#777;</p>
  <p id=point>Using CSS Entity on a: a</p>
</body>
</html>

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HTML Entity for Hook Above (U+0309)