ideally, an SVG layout optimised for web app design would be somewhat more flexible than just grid and flex - such as anchoring an element to 2 other separate p

ideally, an SVG layout optimised for web app design would be somewhat more flexible than just grid and flex - such as anchoring an element to 2 other separate parents (or in other words, supporting a directed graph rather than a tree). A pure constraint system would be nice, but is probably not viable if fast rendering is important (which, it is).