DOMpurify claims to be a sanitizer for SVG but unfortunately all tags are transformed to lower case.

After sanitizing, I get a document with all lowercase tags (unlike the original).

SVG tags are (unlike HTML) case-sensitive and some tags like feBlend, feGaussianBlur and all other filter tags contain uppercase letters. SVG parsers don't recognize tags like <fegaussianblur>, so this causes the SVG document to render incorrectly.

Can this behaviour please be made configurable?

BTW, it seems that the ADD_TAGS configuration expects lowercase names as well, or they won't be accepted.