Chawan started out as a w3m clone, and the UI still resembles it. However, the architecture has turned out quite different, with pages loaded in separate processes, and protocol/file type handling separated out into external binaries. An interesting result is that you can even register decoders for custom inline image formats, although practical use cases of this are rather minimal.
There is a gallery showcasing some websites being rendered here: https://chawan.net/gallery/index.html
[1]: https://nim-lang.org
Having support for some CSS makes it a bit more difficult, as spacing between elements is now an issue, where previously links would ignore margins and padding all together which were used to display cleaner inline list elements (for menus and such).
But if you really want custom CSS for grid displays, chawan does support the standard "grid" media feature: https://developer.mozilla.org/en-US/docs/Web/CSS/@media/grid