files/en-us/web/api/svgfecompositeelement/in1/index.md
{{APIRef("SVG")}}
The in1 read-only property of the {{domxref("SVGFECompositeElement")}} interface reflects the {{SVGAttr("in")}} attribute of the given {{SVGElement("feComposite")}} element.
An {{domxref("SVGAnimatedString")}} object.
In this example, two {{SVGElement("feComposite")}} elements are defined in a filter, each with a different in attribute.
<svg viewBox="0 0 200 200" xmlns="http://www.w3.org/2000/svg">
<filter id="filter1">
<feImage
href="https://mdn.github.io/shared-assets/images/examples/progress-pride-flag.jpg"
width="200" />
<feComposite in="SourceGraphic" operator="over" />
<feComposite in="SourceGraphic" operator="in" />
</filter>
<circle cx="50" cy="50" r="30" filter="url(#filter1)" />
</svg>
We can access the in attribute:
const composites = document.querySelectorAll("feComposite");
console.log(composites[0].in1.baseVal); // output: "SourceGraphic"
console.log(composites[1].in1.baseVal); // output: "SourceGraphic"
{{Specifications}}
{{Compat}}