The in1 read-only property of the SVGFEOffsetElement interface reflects the in attribute of the given <feOffset> element.
An SVGAnimatedString object.
in attribute of <feOffset> elementIn this example, we access the in attribute value of the <feOffset> element by using the in1 read-only property of the SVGFEOffsetElement interface.
<svg viewBox="0 0 200 200" xmlns="http://www.w3.org/2000/svg">
<defs>
<filter id="offsetFilter">
<!-- Applies an offset to the SourceGraphic -->
<feOffset in="SourceGraphic" dx="10" dy="10" />
</filter>
</defs>
<rect
x="20"
y="20"
width="100"
height="100"
fill="lightblue"
filter="url(#offsetFilter)" />
</svg>We can access the in attribute of the feOffset element.
// Select the feOffset element
const offsetElement = document.querySelector("feOffset");
// Access the in1 property
console.log(offsetElement.in1.baseVal); // Output: "SourceGraphic"