The new MDN design looks snazzy but no longer works in NetSurf. I would hope a resource like this was highly accessible, even to browsers without CSS3 support (isn't this why we have @supports?). It's also furthering a trope of themes being a binary toggle; there are more options than just white and gray--how about OLED black to conserve the least about of power (looks better on my screens too).
I agree that pages about web development should themselves not depend on CSS3 support at the renderer because it's a huge step forward from CSS2 and the documentation itself is just simple documents rather than complex layouts. This has the air of web designers not having even considered this aspect and just went with modern web standards as usual. So an issue should maybe be raised about this. As I browse the site,…
But I don't think it would be useful unless MDN merges in the changes. My daily web browser struggles with the new MDN rendering unless JS is disabled. So I've lost a few features since the "design change", notably I cannot run the examples. Would I use a cloned site that's faster and where CSS&JS are more compatible? I would loose the external search I'm used to (DuckDuckGo !mdn), so using the clone would require a few changes on my side...