HTML Code

<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="UTF-8">

  <meta name="viewport" content="width=device-width, initial-scale=1.0">

  <title>CSS transition-property Example</title>

  <style>

    body {

      font-family: system-ui, sans-serif;

      padding: 20px;

      background: #f8fafc;

      color: #334155;

    }



    .box {

      width: 100px;

      height: 100px;

      background-color: #2563eb;

      border-radius: 0.35rem;

      transition-property: width, background-color;

      transition-duration: 2s;

    }



    .box:hover {

      width: 200px;

      background-color: #dc2626;

    }

  </style>

</head>

<body>

  <h1>Transition Property Example</h1>

  <p>Hover over the box — width and color animate, height stays instant.</p>

  <div class="box"></div>

</body>

</html>

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CSS transition-property Property - Width and Color