Today I'm seeing a theming issue:

It looks like cache problem, so I'm going to investigate step by step...

...damned, opening the Firefox console solved the issue (the no-cache were ticked), so we have a browser cache issue: users with the old theme in their local cache may get what I got.

I unticked the Firefox network console "disable cache" and tried all other translations to try to reproduce, and was able to reproduce it once:

The request done by my browser was:

curl 'https://docs.python.org/zh-cn/3.10/_static/pydoctheme.css' -H 'User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:88.0) Gecko/20100101 Firefox/88.0' -H 'Accept: text/css,*/*;q=0.1' -H 'Accept-Language: fr,en-US;q=0.7,en;q=0.3' --compressed -H 'DNT: 1' -H 'Connection: keep-alive' -H 'Referer: https://docs.python.org/zh-cn/3.10/library/functions.html' -H 'Sec-GPC: 1' -H 'TE: Trailers'

(Which, using curl, give the up-to-date file)

But got no response (first time I see this) it were "raced" (by the local cache?) I only see 882 B (raced) in the network pane, no more info.

According to https://support.mozilla.org/en-US/questions/1267945 this display mean the network won the race, which looks wrong because I have no response header and the css is the old one:

Also the size is too low to contain the whole css, so it looks like the network connection has started, bytes has been received, but the cache won the race and the network connection was interrupted.

Which I find strange is that when I refresh, all other components are requested by my browser, which all properly receive a "304 not modified" answer, but not the CSS itself: