SuperHTML offers validation and autoformatting features for HTML files.
It can be used either directly or through its LSP client implementation.

WWW: https://github.com/kristoff-it/superhtml

Remark:

It's a zig-based port with external dependencies which introduces significant
awkwardness - happy to take suggestions about how to reduce that.

Once built, it works perfectly however.

• superhtml.tar.gz (2K)