The height read-only property of the SVGFEComponentTransferElement interface describes the vertical size of an SVG filter primitive as a SVGAnimatedLength.
It reflects the <feComponentTransfer> element's height filter primitive attribute. The <feComponentTransfer> filter performs component-wise color and alpha transparency remapping, allowing for brightness, contrast, color balance and threshold adjustments.
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 feComponentTransfer = document.querySelector("feComponentTransfer");
const verticalSize = feComponentTransfer.height;
console.log(verticalSize.baseVal.value); // the `height` value