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 mask-mode Example</title>



  <style>



    body {



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



      padding: 1.5rem;



      line-height: 1.6;



      background: #f8fafc;



    }







    .demo-wrap {



      display: flex;



      flex-wrap: wrap;



      gap: 1.5rem;



    }







    .mask-alpha,



    .mask-luminance {



      width: 280px;



      height: 200px;



      background: url('/images/valley-pattern.jpg') center/cover;



      -webkit-mask-size: contain;



      mask-size: contain;



      -webkit-mask-repeat: no-repeat;



      mask-repeat: no-repeat;



      -webkit-mask-position: center;



      mask-position: center;



    }







    .mask-alpha {



      -webkit-mask-image: url('/images/apple.png');



      mask-image: url('/images/apple.png');



      -webkit-mask-mode: alpha;



      mask-mode: alpha;



    }







    .mask-luminance {



      -webkit-mask-image: url('/images/orange.png');



      mask-image: url('/images/orange.png');



      -webkit-mask-mode: luminance;



      mask-mode: luminance;



    }



  </style>



</head>



<body>



  <h1>Mask Mode Example</h1>



  <div class="demo-wrap">



    <div>



      <p><strong>Alpha Mask</strong></p>



      <div class="mask-alpha"></div>



    </div>



    <div>



      <p><strong>Luminance Mask</strong></p>



      <div class="mask-luminance"></div>



    </div>



  </div>



</body>



</html>

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CSS mask-mode Property - alpha vs luminance