HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>beforematch prepare UI</title>
  <style>
    #faq-panel { margin-top: 1rem; padding: 1rem; border: 2px solid #333; }
    #faq-panel.was-found { border-color: green; background: #eaffea; }
  </style>
</head>
<body>
  <a href="#faq-panel">Open FAQ panel</a>
  <p id="status">Not revealed yet</p>
  <div id="faq-panel" hidden="until-found">
    FAQ answer: hidden until found keeps content searchable.
  </div>
  <script>
    var panel = document.getElementById("faq-panel");
    var status = document.getElementById("status");
    panel.addEventListener("beforematch", function () {
      panel.classList.add("was-found");
      status.textContent = "Revealed at " + new Date().toLocaleTimeString();
    });
  </script>
</body>
</html>

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Element beforematch — prepare UI (Try It)