Handcrafting SVG because Inkscape doesn't work with relative sizes and positioning, but SVG does.
Which is, by the way, not a complaint about Inkscape. More of a soft requirement that may be a bit unusual.
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The way I'm doing it is somewhat akin to how in e.g. Android you design for various different screen sizes: I'm aligning everything to a grid, and am working with percentage offsets.
What I miss from SVG are anchor points and the ability to calculate offsets from those. I haven't seen much that would suggest it's possible so far.
I *could* go about all of this differently, of course, but there is also a point to this that involves understanding SVG better.
