The result read-only property of the SVGFEDiffuseLightingElement interface describes the assigned name of an SVG filter primitive as a SVGAnimatedString.
It reflects the <feDiffuseLighting> element's result attribute. The filter lights an image using the alpha channel as a bump map. The attribute value is a <custom-ident>. If supplied, then graphics that result from processing this filter primitive can be referenced by an in attribute on a subsequent filter primitive within the same <filter> element.
If no result attribute is defined, the filter's result.baseVal and result.animVal are empty strings, and the output of the <feDiffuseLighting> filter will only be available for re-use as the implicit input into the next filter primitive if that filter primitive provides no value for its in attribute.
const feDiffuseLightingElement = document.querySelector("feDiffuseLighting");
const filterName = feDiffuseLightingElement.result;
console.log(filterName.baseVa); // the filter's assigned nameSVGFEDiffuseLightingElement.in1<custom-ident> data typeSVGFESpecularLightingElement<feSpecularLighting><blend-mode> data typemix-blend-mode property