HTML Code

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

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

    .base {
    width: 220px;
    height: 140px;
    background: linear-gradient(135deg, #6366f1, #ec4899);
    -webkit-mask-image: linear-gradient(to right, #000, #008000, #fff);
    mask-image: linear-gradient(to right, #000, #008000, #fff);
      mask-mode: luminance;
    }

    .reset {
      margin-top: 12px;
      mask-mode: initial;
    }
  </style>
</head>
<body>
  <p>The second box uses <strong>mask-mode: initial</strong> (back to match-source / alpha here).</p>
  <div class="base"></div>
  <div class="base reset"></div>
</body>
</html>

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CSS mask-mode Property — initial