Mercury13
Mercury13
About 2 — there’s an exception: one of the filled spaces is really small. E.g. Sweden: just draw the cross, blue fringe is almost invisible and is even part of...

(see SVG’s wireframe) Not optimized at all, use any software you want to optimize.
Here’s wireframe of a random tricolour (Germany). My remake, of course. 
“Full overlap” etc are probably meant for embroidery/cutting machines. We should make overlaps for ourselves.
Conversely, these options meant for embroidery make pixel rendering really horrible.
Not enough. And I have made for you: https://github.com/twitter/twemoji/pull/1116#issuecomment-2405784316
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I wrote: optimize with whatever software you want. In my Unicodia flags are Twemoji-based (made before SVGization of waved Noto flags, and just simpler). Rules are (a bit contradict to...
Black better replace. Red and green do not really matter, and it’s BETTER to check country’s flag habits and shift to Twitter’s palette. As I’m from Ukraine, and until recently...