2025-scroll-state/scroll-state-2-scrollable.html at main · codegrid/2025-scroll-state · GitHub

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<!DOCTYPE html>
<html lang="ja">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Demo</title>
  <style>
    .scroller {
      container-type: scroll-state;
      position: relative;
      width: 300px;
      height: 300px;
      overflow: auto;
      margin: 0 auto;
      background-color: #60969b;
      border-radius: 10px;
      color: #fff;
    }

    .key {
      container-type: scroll-state;
      position: sticky;
      top: 0;
      font-size: 24px;
    }

    .key > .header {
      display: block;
      font-weight: bold;
      padding: 8px 16px;
      color: #cae4ff;
      font-size: 18px;
      transition: 0.2s;

      @container scroll-state(stuck: top) {
        background-color: #123a3c;
        box-shadow: 0 2px 3px #0003;
      }
    }

    .value {
      margin: 0;
      padding: 8px 16px;
    }

    .value + .key {
      margin-top: 16px;
    }

    .scroll-top-button {
      --button-size: 40px;
      position: sticky;
      display: block;
      bottom: 10px;
      left: calc(100% - (var(--button-size) + 10px));
      width: var(--button-size);
      height: var(--button-size);
      background-color: #fff;
      border-radius: 100%;
      cursor: pointer;
      border: 1px solid #fff;
      font-size: 30px;
      transition: 0.2s all;
      translate: 0 calc(100% + 10px);

      &:hover {
        background-color: #000;
        color: #fff;
      }

      @container scroll-state(scrollable: top) {
        translate: 0 0;
      }
    }
  </style>
  <style>
  @supports not (container-type: scroll-state) {
    body::before {
      /* 日本語で */
      content: "お使いのブラウザは、scroll-stateのコンテナクエリーをサポートしていません。";
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: black;
      color: white;
      text-align: center;
      padding: 10px;
    }
  }
  </style>
</head>
<body>

  <div class="scroller">

    <div class="key"><span class="header">あ</span></div>
    <div class="value">あし</div>
    <div class="value">あり</div>
    <div class="value">あめ</div>
    <div class="value">あさ</div>
    <div class="value">あお</div>

    <div class="key"><span class="header">か</span></div>
    <div class="value">かき</div>
    <div class="value">かもめ</div>
    <div class="value">かさ</div>
    <div class="value">かに</div>
    <div class="value">かぜ</div>

    <div class="key"><span class="header">さ</span></div>
    <div class="value">さくら</div>
    <div class="value">さかな</div>
    <div class="value">さる</div>
    <div class="value">さと</div>
    <div class="value">さとう</div>

    <div class="key"><span class="header">た</span></div>
    <div class="value">たけ</div>
    <div class="value">たぬき</div>
    <div class="value">たまご</div>
    <div class="value">たいこ</div>
    <div class="value">たに</div>

    <div class="key"><span class="header">な</span></div>
    <div class="value">なし</div>
    <div class="value">なす</div>
    <div class="value">なべ</div>
    <div class="value">なか</div>
    <div class="value">なみ</div>

    <div class="key"><span class="header">は</span></div>
    <div class="value">はな</div>
    <div class="value">はと</div>
    <div class="value">はし</div>
    <div class="value">はる</div>
    <div class="value">はやし</div>

    <div class="key"><span class="header">ま</span></div>
    <div class="value">まつ</div>
    <div class="value">まめ</div>
    <div class="value">まど</div>
    <div class="value">まち</div>
    <div class="value">まんが</div>

    <div class="key"><span class="header">や</span></div>
    <div class="value">やま</div>
    <div class="value">やぎ</div>
    <div class="value">やね</div>
    <div class="value">やさい</div>
    <div class="value">やし</div>

    <div class="key"><span class="header">ら</span></div>
    <div class="value">らいおん</div>
    <div class="value">らくだ</div>

    <button class="scroll-top-button" title="リストの最初に戻る">⇡</button>
  </div>

  <script>
    document.querySelectorAll(".scroll-top-button").forEach((el)=>{
      el.addEventListener('click', ()=>{
        el.closest('.scroller').scrollTo({
          top: 0,
          left: 0,
          behavior: 'smooth'
        });
      })
    })
  </script>

</body>
</html>