QGIS in the browser, with real geometry

I built a demo that runs QGIS compiled to WebAssembly in the browser, exposes GEOS to JavaScript, and adds multiplayer editing on top. It&rsquo;s called gisma, and you can try it at gisma-4cbc4e.netlify.app. There are plenty of web map editors. What&rsquo;s different here is that the geometry engine is real. When you run a buffer or an intersect in gisma, it&rsquo;s not a JavaScript approximation…