2026-css-anchor-positioning/anchor-multiple.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>複数のアンカーを基準にする</title>
  <style>
    *, *::before, *::after {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      font-family: sans-serif;
      min-height: 100vh;
      background-color: #f5f5f5;
      position: relative;
    }

    .anchor-a {
      anchor-name: --anchor-a;
      position: absolute;
      top: 50px;
      left: 50px;
      padding: 8px 16px;
      background-color: #1a73e8;
      color: #fff;
      border-radius: 4px;
    }

    .anchor-b {
      anchor-name: --anchor-b;
      position: absolute;
      top: 200px;
      right: 100px;
      padding: 8px 16px;
      background-color: #e8711a;
      color: #fff;
      border-radius: 4px;
    }

    .positioned {
      position: absolute;
      /* position-anchor は指定しない。anchor() の引数でアンカー名を直接指定する */
      top: anchor(--anchor-a bottom);
      left: anchor(--anchor-a right);
      bottom: anchor(--anchor-b top);
      right: anchor(--anchor-b left);
      margin: 8px;
      background-color: rgba(26, 115, 232, 0.1);
      border: 2px dashed #1a73e8;
      display: flex;
      align-items: center;
      justify-content: center;
    }
  </style>
</head>
<body>
  <div class="anchor-a">アンカーA</div>
  <div class="anchor-b">アンカーB</div>
  <div class="positioned">AとBの間</div>
</body>
</html>