I'm writing my web publishing platform to work on HTML4 and CSS2 standard so I can brag about how it's still performant on Mac OS9.

I just need background images, absolute positioning, <area> + image-map, and form submission to work as expected. No JS.

Classic Macs aside, I would be thrilled to find a no frills rendering engine that I could package up like an Electron app serving from localhost, but without all the performance expectations of electron apps. I'm imagining like what Ionic does for apps -- just wrap everything in an OS provided web viewer -- what's out there like that for desktop?