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<!DOCTYPE html>
<html lang="vi">
<head>
  <meta charset="UTF-8">
  <title>Hook Above (U+0309) in HTML</title>
  <style>
    #point::after {
      content: "a\0309";
    }
  </style>
</head>
<body>
  <p>Built with Hex: a&#x0309;</p>
  <p>Built with Decimal: a&#777;</p>
  <p id="point">Built with CSS: </p>
  <p>Typed: a&#x0309;</p>
  <p>Precomposed (preferred): &#x1EA3;</p>
  <p><span aria-label="a with Hook Above">a&#x0309;</span></p>
</body>
</html>

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HTML Entity for Hook Above (U+0309)