2026-css-anchor-positioning/position-visibility.html at main · codegrid/2026-css-anchor-positioning · 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">
  <link rel="stylesheet" href="style.css">
  <title>position-visibilityでツールチップを非表示にする</title>
  <style>
    *, *::before, *::after {
      box-sizing: border-box;
    }

    html {
      height: 300px;
    }

    body {
      margin: 0;
      height: 300px;
      overflow: hidden;
      font-family: sans-serif;
      background-color: #f0f4f8;
      display: flex;
      align-items: flex-start;
      padding: 16px;
    }

    /* スクロールリスト */
    .list-panel {
      width: 200px;
      background: #fff;
      border-radius: 8px;
      overflow: hidden;
      box-shadow: 0 1px 4px rgba(0, 0, 0, 0.12);
    }

    .list-header {
      padding: 8px 14px;
      font-size: 11px;
      font-weight: bold;
      color: #888;
      letter-spacing: 0.5px;
      border-bottom: 1px solid #f0f0f0;
      background: #fafafa;
    }

    .list {
      /* 300px(html) - 32px(body padding) - 32px(list-header) = 236px */
      height: 236px;
      overflow-y: auto;
    }

    .item {
      display: flex;
      align-items: center;
      padding: 10px 14px;
      gap: 10px;
      border-bottom: 1px solid #f5f5f5;
    }

    .item--active {
      anchor-name: --tooltip-anchor;
      background-color: #eff6ff;
    }

    .avatar {
      width: 34px;
      height: 34px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #fff;
      font-size: 14px;
      font-weight: bold;
      flex-shrink: 0;
    }

    .item:nth-child(1) .avatar { background: #1a73e8; }
    .item:nth-child(2) .avatar { background: #34a853; }
    .item:nth-child(3) .avatar { background: #ea4335; }
    .item:nth-child(4) .avatar { background: #f59e0b; }
    .item:nth-child(5) .avatar { background: #8b5cf6; }
    .item:nth-child(6) .avatar { background: #0d9488; }
    .item:nth-child(7) .avatar { background: #e11d48; }
    .item:nth-child(8) .avatar { background: #f97316; }

    .name {
      font-size: 13px;
      color: #333;
    }

    .tooltip {
      position: fixed;
      position-anchor: --tooltip-anchor;
      position-area: center right;
      margin: 0 0 0 8px;
      padding: 5px 10px;
      background: #1e293b;
      color: #fff;
      border-radius: 6px;
      font-size: 11px;
      white-space: nowrap;
      position-visibility: anchors-visible;
    }

    .tooltip::before {
      content: '';
      position: absolute;
      left: -5px;
      top: 50%;
      translate: 0 -50%;
      border: 5px solid transparent;
      border-left: none;
      border-right-color: #1e293b;
    }
  </style>
</head>
<body>
  <div class="list-panel">
    <div class="list-header">ユーザー一覧（スクロールできます）</div>
    <div class="list">
      <div class="item">
        <span class="avatar">田</span>
        <span class="name">田中 一郎</span>
      </div>
      <div class="item">
        <span class="avatar">鈴</span>
        <span class="name">鈴木 花子</span>
      </div>
      <div class="item item--active">
        <span class="avatar">佐</span>
        <span class="name">佐藤 次郎</span>
      </div>
      <div class="item">
        <span class="avatar">山</span>
        <span class="name">山田 三恵</span>
      </div>
      <div class="item">
        <span class="avatar">高</span>
        <span class="name">高橋 四郎</span>
      </div>
      <div class="item">
        <span class="avatar">渡</span>
        <span class="name">渡辺 五月</span>
      </div>
      <div class="item">
        <span class="avatar">伊</span>
        <span class="name">伊藤 六美</span>
      </div>
      <div class="item">
        <span class="avatar">中</span>
        <span class="name">中村 七海</span>
      </div>
    </div>
  </div>

  <div class="tooltip">バックエンドエンジニア</div>
</body>
</html>