It’s basic HTML. The simple tags are allowed here: a, ul, ol, b, s, i, sup, sub, pre, img
Mostly just the formatting tags, but they’re useful. Here’s a good resource and cheatsheet for HTML markup
In a past life, I was a web designer. There’s not much of a future for that particular skill. I think at the very least HTML and JavaScript or Python should be taught in grade school as part of the basic skill set everyone should have. Otherwise the internet’s guts look like gobbledygook, and people won’t be able to as effectively and basically express themselves on the web.
