2026-dialog/demo3.html at main · codegrid/2026-dialog · GitHub

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<html>
<head>
<meta charset="UTF-8">
<title>閉じるときのアニメーション（transition-behavior: allow-discrete）</title>
<style>
body {
  font-family: sans-serif;
}

dialog {
  padding: 32px;
  border: 1px solid #ccc;
  max-width: 320px;
  transition-property: opacity, transform, display, overlay;
  transition-duration: .5s;
  transition-behavior: allow-discrete;

  @starting-style {
    opacity: 0;
    transform: scale(0.9);
  }
}

dialog:not([open]) {
  opacity: 0;
  transform: scale(.9);
}

dialog::backdrop {
  background: rgb(0 0 0 / 0.4);
  transition-property: display, overlay, background-color;
  transition-duration: .5s;
  transition-behavior: allow-discrete;

  @starting-style {
    background-color: rgb(0 0 0 / 0);
  }
}

dialog:not([open])::backdrop {
  background-color: rgb(0 0 0 / 0);
}
</style>
</head>
<body>
<button onclick="modal3.showModal()">モーダルを開く</button>

<dialog id="modal3">
  <p>開閉にアニメーションがあります（<code>transition-behavior: allow-discrete</code>）。</p>
  <button onclick="modal3.close()">閉じる</button>
</dialog>
</body>
</html>