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Showing content from http://developer.mozilla.org/en-US/docs/Web/API/SVGFEDisplacementMapElement/in2 below:

SVGFEDisplacementMapElement: in2 property - Web APIs

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The in2 read-only property of the SVGFEDisplacementMapElement interface reflects the in2 attribute of the given <feDisplacementMap> element.

An SVGAnimatedString object.

In this example, two <feDisplacementMap> elements are defined in a filter, each with a different in2 attribute.

<svg viewBox="0 0 200 200" xmlns="http://www.w3.org/2000/svg">
  <defs>
    <filter id="filter1">
      <!-- First Displacement Map -->
      <feDisplacementMap in="SourceGraphic" in2="BackgroundImage" scale="20">
        <feFuncR type="table" tableValues="0 1" />
      </feDisplacementMap>

      <!-- Second Displacement Map -->
      <feDisplacementMap in="SourceGraphic" in2="BackgroundImage" scale="30">
        <feFuncR type="table" tableValues="0.5 1" />
      </feDisplacementMap>
    </filter>
  </defs>
  <rect
    x="20"
    y="20"
    width="100"
    height="100"
    fill="red"
    filter="url(#filter1)" />
  <circle cx="100" cy="100" r="50" fill="blue" filter="url(#filter1)" />
</svg>

We can access the in2 attribute:

const displacementMaps = document.querySelectorAll("feDisplacementMap");

console.log(displacementMaps[0].getAttribute("in2")); // Output: "BackgroundImage"
console.log(displacementMaps[1].getAttribute("in2")); // Output: "BackgroundImage"

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