HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>[href] vs [href=]</title>
  <style>
    a[href] {
      text-decoration: underline;
    }

    a[href="https://example.org"] {
      color: green;
      font-weight: bold;
    }
  </style>
</head>
<body>
  <p><a href="https://example.org">Exact match (green)</a></p>
  <p><a href="https://example.com">Has href only</a></p>
</body>
</html>

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CSS Attribute Selector — presence vs equals