<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>CSS Masking: mask-mode with raster image</title>
    <link rel="author" title="CJ Ku" href="mailto:cku@mozilla.com">
    <link rel="author" title="Mozilla" href="https://www.mozilla.org">
    <link rel="help" href="https://www.w3.org/TR/css-masking-1/#propdef-mask-mode">
    <link rel="match" href="mask-mode-ref.html">
    <meta name="assert" content="Test checks that whether mask-mode is filled automatically according to the number of mask layers.">
    <style type="text/css">
      div {
        background-color: blue;
        position: absolute;
        margin: 0px;
        padding: 0px;
        width: 100px;
        height: 100px;
        top: 10px;
      }

      div.auto {
        left: 10px;
        mask-mode: match-source;
        mask-image: linear-gradient(black 0%, black 100%), linear-gradient(blue 0%, blue 100%);
      }

      div.alpha {
        left: 120px;
        mask-mode: alpha alpha;
        mask-image: linear-gradient(black 0%, black 100%), linear-gradient(blue 0%, blue 100%);
      }

      div.luminance1 {
        left: 230px;
        mask-mode: luminance;
        mask-image: linear-gradient(black 0%, black 100%), linear-gradient(blue 0%, blue 100%);
      }

      div.luminance2 {
        left: 340px;
        mask-mode: luminance;
        mask-image: linear-gradient(black 0%, black 100%), linear-gradient(red 0%, red 100%);
      }

      div.luminance3 {
        left: 450px;
        mask-mode: luminance;
        mask-image: linear-gradient(black 0%, black 100%), linear-gradient(lime 0%, lime 100%);
      }
    </style>
  </head>
  <body>
    <div class="auto"></div>
    <div class="alpha"></div>
    <div class="luminance1"></div>
    <div class="luminance2"></div>
    <div class="luminance3"></div>
  </body>
</html>