2025-scroll-state/scroll-state-snapped.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>
    html,
    body {
      width: 100%;
      height: 100%;
    }

    html {
      overflow: hidden;
    }

    body {
      margin: 0;
      overflow: auto;
    }

    body {
      scroll-snap-type: y mandatory;
    }

    .ScrollSnap-item {
      scroll-snap-align: center;
      display: flex;
      justify-content: center;
      align-items: center;
      height: 100vh;
      font-size: 50vh;
      text-shadow: 2px 2px 0 rgba(255, 255, 255, 0.3);
      container-type: scroll-state; /* 追記 */
    }

    /* 追記 */
    .ScrollSnap-item > span {
      scale: 1.5;
      opacity: 0;
      transition: all 2s 0.5s; /* 0.5s遅らせて2sかけて変化する */
    }
    @container scroll-state(snapped: y) {
      .ScrollSnap-item > span {
        opacity: 1;
        scale: 1;
      }
    }


    .ScrollSnap-item:nth-child(1) {
      background-color: floralwhite;
    }

    .ScrollSnap-item:nth-child(2) {
      background-color: deepskyblue;
    }

    .ScrollSnap-item:nth-child(3) {
      background-color: yellowgreen;
    }

    .ScrollSnap-item:nth-child(4) {
      background-color: tomato;
    }

    .ScrollSnap-item:nth-child(5) {
      background-color: darkslategray;
    }
  </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="ScrollSnap-item"><span>1</span></div>
<div class="ScrollSnap-item"><span>2</span></div>
<div class="ScrollSnap-item"><span>3</span></div>
<div class="ScrollSnap-item"><span>4</span></div>
<div class="ScrollSnap-item"><span>5</span></div>

</body>
</html>