LayoutTests/svg/filters/innershadow.svg

<svg width="800" height="400" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
  <g transform="scale(2)">
    <use xlink:href="#rectpair" filter="url(#ct)" x="10" y="150"/>
    <use xlink:href="#rectpair" filter="url(#cm)" x="125" y="150"/>
    <use xlink:href="#rectpair" filter="url(#ar)" x="240" y="150"/>
  </g>
  <defs>
    <g id="rectpair" clipPathUnits="userSpaceOnUse">
      <rect x="0" y="-100" width="100" height="100"
        fill="red"/>
      <rect x="7" y="-93" width="93" height="93" fill="green"/>
    </g>
    <filter id="ct">
      <feOffset in="SourceGraphic" dx="10" dy="10"/>
      <feGaussianBlur stdDeviation="1 1"/>
      <feComponentTransfer>
        <feFuncR type="linear" intercept="0"
          slope="0"/>
        <feFuncG type="linear" intercept="0"
          slope="0"/>
        <feFuncB type="linear" intercept="0"
          slope="0"/>
        <feFuncA type="linear" intercept="1" slope="-1"/>
      </feComponentTransfer>
      <feComposite in2="SourceGraphic" operator="atop"/>
    </filter>
    <filter id="cm">
      <feOffset in="SourceGraphic" dx="10" dy="10"/>
      <feGaussianBlur stdDeviation="1 1"/>
      <feColorMatrix type="matrix" values="0 0 0 0 0  0 0 0 0 0  0 0 0 0 0  0 0 0 -1 1"/>
      <feComposite in2="SourceGraphic" operator="atop"/>
    </filter>
    <filter id="ar">
      <feOffset in="SourceGraphic" dx="10" dy="10"/>
      <feGaussianBlur stdDeviation="1 1" result="blur"/>
      <feComposite in="blur" in2="blur" operator="arithmetic" k2="-1" k4="1"/>
      <feComponentTransfer>
        <feFuncR type="linear" intercept="0"
          slope="0"/>
        <feFuncG type="linear" intercept="0"
          slope="0"/>
        <feFuncB type="linear" intercept="0"
          slope="0"/>
      </feComponentTransfer>
      <feComposite in2="SourceGraphic" operator="atop"/>
    </filter>
  </defs>
</svg>