HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>::target-text demo</title>
  <style>
    ::target-text {
      background-color: rebeccapurple;
      color: white;
    }
    p { font-family: system-ui, sans-serif; line-height: 1.5; }
  </style>
</head>
<body>
  <p>Open a #:~:text= link to this page to see ::target-text highlight a match.</p>
  <p>This paragraph contains an important phrase for demos.</p>
  <pre id="out"></pre>
  <script>
    document.getElementById("out").textContent =
      "fragmentDirective support: " + !!document.fragmentDirective +
      "\n(::target-text rule is in the stylesheet)";
  </script>
</body>
</html>

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::target-text + fragmentDirective (Try It)