The href read-only property of the SVGFilterElement interface reflects the href or xlink:href attribute of the given <filter> element.
href property<svg xmlns="http://www.w3.org/2000/svg" width="400" height="200">
<defs>
<filter id="myFilter" x="0" y="0" width="200%" height="200%">
<feGaussianBlur in="SourceGraphic" stdDeviation="15" result="blurred" />
</filter>
</defs>
<rect
width="200"
height="200"
stroke="green"
stroke-width="10"
fill="lime"
filter="url(#myFilter)" />
</svg>const filterElement = document.querySelector("filter");
// Access the href property
console.log(filterElement.href.baseVal); // Output: "#myFilter"href attribute