HTML Code

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

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

    div {
      height: 160px;
      border: 2px dashed #334155;
      background: linear-gradient(135deg, #2563eb, #7c3aed);
      mask-image: url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' width='120' height='80'><ellipse cx='60' cy='40' rx='56' ry='36' fill='%23000'/></svg>");
      mask-repeat: no-repeat;
      mask-position: center;
      mask-size: cover;
    }
  </style>
</head>
<body>
  <p><strong>cover</strong> fills the box. Parts of the 120×80 SVG mask may be cropped.</p>
  <div></div>
</body>
</html>

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CSS mask-size Property — cover