The example with the invalid SVG color "#FF000080" is a bad example. Different handling of invalid files is not a bug but a design decision to show some thing at all.
Have you looked at the old SVG-Mobile?
Btw. All well known vector file formats have the tendency to become to monsters over time. Ave a look at PS, EPS, PDF and font file formats. And most of the time Adobe was involved.
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Take off every Zig!