HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>startViewTransition types</title>
  <style>
    body { font-family: sans-serif; margin: 1rem; }
    #card {
      width: 160px; height: 100px; background: #0ea5e9; color: white;
      display: flex; align-items: center; justify-content: center;
      border-radius: 8px; cursor: pointer; user-select: none;
    }
    #card.flipped { background: #7c3aed; transform: scale(1.05); }
    pre { font-family: monospace; font-size: 12px; }
  </style>
</head>
<body>
  <div id="card">Flip me</div>
  <pre id="out">types: []</pre>
  <script>
    var card = document.getElementById("card");
    card.addEventListener("click", function () {
      function update() { card.classList.toggle("flipped"); }
      if (!card.startViewTransition) {
        update();
        document.getElementById("out").textContent = "No API — instant flip";
        return;
      }
      card.startViewTransition({
        update: update,
        types: ["flip", "card-update"]
      });
      document.getElementById("out").textContent = 'types: ["flip", "card-update"]';
    });
  </script>
</body>
</html>

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Element.startViewTransition — options.types (Try It)