HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>transition-timing-function: linear</title>
  <style>
    body {
      font-family: Arial, sans-serif;
      margin: 16px;
      color: #0f172a;
    }

    p {
      margin: 0 0 12px;
      max-width: 40rem;
      line-height: 1.5;
    }

    .track {
      width: 240px;
      padding: 8px;
      border: 1px solid #cbd5e1;
      background: #f8fafc;
    }

    .box {
      width: 48px;
      height: 48px;
      background: #2563eb;
      transition-property: transform;
      transition-duration: 1s;
      transition-timing-function: linear;
    }

    .track:hover .box,
    .track:focus-within .box {
      transform: translateX(180px);
    }
  </style>
</head>
<body>
  <p><strong>linear</strong> — hover or focus the track (constant speed).</p>
  <div class="track" tabindex="0">
    <div class="box"></div>
  </div>
</body>
</html>

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CSS transition-timing-function Property — linear