Ahh… it turns out that the problem is that I didn’t remove the comments from the sample HTML code. After I removed it, it works!
Btw, I realize that I didn’t directly link to the codes for the Discord work skin. Here it is if there’s anyone here who wanna use it:
https://gist.github.com/wovenstarlight/1c00c15ca299b9c70914e65206c8d096