Let's take a look at what SVG filters are and the basics of how they work.

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A beginner's guide to SVG filters covering the foundational concepts needed to start using them. Topics include how to properly embed the hidden SVG container in HTML, the structure of the filter element with its id and color-interpolation-filters attributes, filter region configuration via x/y/width/height and filterUnits, and how filter primitives (fe-prefixed elements) work including their input/output chaining via in, in2, and result attributes. Also explains the difference between filterUnits and primitiveUnits, and highlights a key limitation: length values can only be absolute pixels or relative to the bounding box, not relative to font-size or viewport units.

SVG Filters Guide: Getting Started with the Basics – Frontend Masters Blog