TIL that ublock lets you inject CSS. I've been using tampermonkey for that (most recently to fix the mspace tags on ncatlab.org).
Re:Hacker News needs a Dark Mode
by hn92726819 on Thursday June 15, 2023 @12:44PM
(#36343202)
> means "if the host matches news.ycombinator.com inject the following CSS"
Well I wouldn't word it like that.
youtube.com##.ytp-cards-teaser
This is a helpful link: https://github.com/gorhill/uBlock/wiki/Introduction-to-basic...
## represents a cosmetic filter. Though I can't seem to figure out what #$# is still but I know that's also possible to use
You should start tinkering with embedded webservers then (civetweb, etc)! Even embedded devs should learn web tech because often browsers are the easiest way to interface with router/modem settings, IoT settings, etc.
In this case "##" is uBlock filter syntax. Basically "news.ycombinator.com##html:style(filter:invert(100%) hue-rotate(180deg))" means "if the host matches news.ycombinator.com inject the following CSS"
Here's the docs if you want to rtfm: https://github.com/gorhill/uBlock/wiki/Dashboard:-My-filters
In this case I believe we are dealing with "cosmetic filters": https://github.com/gorhill/uBlock/wiki/Procedural-cosmetic-f...