I post 3 same posts about this topic on google group but all of them been deleted, I don’t know why if I break the law of the discuss please let me know first I will correct the error.
or obtain the actual file eg w3.css and past it into a tiddler tagged $:/tags/Stylesheet
Actually quite a few CSS fonts and symbol sets even whole CSS frameworks have a CSS only version that can be placed in a tiddler tagged $:/tags/Stylesheet.
Normally they have their own naming standard for their CSS eg “fa_” or " w3-" so they do not clash with standard or tiddlywiki CSS
Note: No JavaScript needed
eg; see install this tiddler w3.css.json (23.2 KB)
Then demonstrate with; <span class="w3-pink">Hello World</span>
If you edit the broken tiddlywiki file directly (backup first) then search for the $:/tags/RawMarkup tag and carefully replace it with something like stop save ands reload in the browser it should fix it.
I would use notpad++ or something similar.
I am not sure about including that JS file, but I will let you figure that out. My suggestion was a css only file as stylesheet. Also the existing fontawesome plugin.
Search for “raw” on tiddlywiki.com to find the documentation
That script file https://kit.fontawesome.com/xxxxx.js must exit on the internet, put it in the browser to see if it exists, and then once loaded in tiddlywiki you then need to use the css to see anything.