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chromium/third_party/blink/web_tests/external/wpt/css/filter-effects/tainting-fedropshadow-001.html 

<!DOCTYPE html>
<title>feDropShadow: no tainting with regular &lt;color> flood-color</title>
<link rel="help" href="https://drafts.fxtf.org/filter-effects/#tainted-filter-primitives">
<link rel="help" href="https://drafts.fxtf.org/filter-effects/#fedisplacemnentmap-restrictions">
<link rel="match" href="reference/green-blue-stripe-100x100.html">
<svg>
  <linearGradient id="g">
    <stop stop-color="red"/>
    <stop stop-color="red" offset=".5"/>
    <stop stop-color="green" offset=".5"/>
    <stop stop-color="green" offset="1"/>
  </linearGradient>
  <filter id="dropshdw_notaint" color-interpolation-filters="sRGB"
          filterUnits="userSpaceOnUse">
    <feFlood x="0" y="0" width="100" height="100"/>
    <feDropShadow width="100%" flood-color="rgb(0%, 100%, 50%)" stdDeviation="0"
                  dx="100" dy="0"/>
    <feOffset dx="-100"/>
    <feDisplacementMap in="SourceGraphic"
                       xChannelSelector="G" yChannelSelector="B"
                       scale="100" x="0" y="0" width="100" height="100"/>
  </filter>
  <rect width="100" height="100" fill="blue"/>
  <rect width="100" height="100" fill="url(#g)" filter="url(#dropshdw_notaint)"/>
</svg>