The height read-only property of the SVGFEGaussianBlurElement interface describes the vertical size of an SVG filter primitive as a SVGAnimatedLength.
It reflects the height attribute of the <feGaussianBlur> element, which blurs an input image. The attribute is a <length> or a <percentage> relative to the height of the filter region. The default value is 100%. The property value is a length in user coordinate system units.
const feGaussianBlur = document.querySelector("feGaussianBlur");
const verticalSize = feGaussianBlur.height;
console.log(verticalSize.baseVal.value); // the `height` valueSVGFEGaussianBlurElement.width<blend-mode> data typeblur() functionmix-blend-mode property