chromium/third_party/blink/web_tests/external/wpt/css/css-masking/mask-image/mask-mode-e.html

<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Masking: mask-mode with gradient on SVG content</title>
<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 a linear-gradient() image referenced by mask-image is correct with different mask modes.">
<meta name="fuzzy" content="maxDifference=0-2; totalPixels=0-11800">
<style type="text/css">
  body {
    padding: 0;
    margin: 0;
  }

  rect {
    fill: blue;
    width: 100px;
    height: 100px;
    y: 10px;
  }

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

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

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

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

  rect.luminance3 {
    x: 450px;
    mask-mode: luminance;
    mask-image: linear-gradient(lime 0%, lime 100%);
  }
</style>
<svg width="600">
  <rect class="auto"/>
  <rect class="alpha"/>
  <rect class="luminance1"/>
  <rect class="luminance2"/>
  <rect class="luminance3"/>
</svg>