HTML Code

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

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

    section {
      display: inline-block;
      padding: 16px;
      border: 1px solid #ccc;
      perspective: 400px;
    }

    div {
      width: 140px;
      height: 90px;
      background: #1d4ed8;
      color: #fff;
      text-align: center;
      line-height: 90px;
      transform: rotateY(180deg);
      backface-visibility: visible;
    }
  </style>
</head>
<body>
  <p>The card is turned 180 degrees. <strong>backface-visibility: visible</strong> paints the back, so Front is a mirror image.</p>
  <section>
    <div>Front</div>
  </section>
</body>
</html>

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CSS backface-visibility Property — visible