With the graphics specifically though, IMO half life 2 (2004) is more similar in terms of fidelity to Portal 2 (2011) than to Half Life 1 (1998). Which does make sense as Half Life 2 and Portal 2 were made in the same engine ofc.

HL1 vs HL2 shows a similar rate of progress

It looks closer to the markdown style of formatting though, and I doubt it has page formatting, or other more advanced formatting, or extensions, or a large selection of fonts. Honestly, even though docs has pageless formatting now, most people don’t use it when they should, making everything unnecessary harder to read, so this will be better in that regard at least. This is probably good enough for 95% of what people use Docs for, but I wouldn’t call it a replacement.

I haven’t used it because I don’t have a French government account, so correct me if I’m wrong about any of that.

Edit: it looks like it only has 1 font and no page formatting