For the URL https://drafts.fxtf.org/filter-effects/#feCompositeElement I am getting ERR_CONNECTION_TIMED_OUT error.
Before the error, I received a detailed message about the internal server error and then one linear 504.

If you are short on infrastructure or funds, then can you create an offline tool, a local web server, to serve the pages from locally cloned spec repositories? After inputting online links it would render the pages from local clonnes? It would really help regular users like web documentation teams.