How would I use html for a gui?

Hello, I am trying to use html scripts for a gui however I haven’t found much on this and I hope you can help me. I’m not asking for a whole system, I am rather just asking to be pointed in the right direction. If you could provide something to help me understand I would greatly appreciate it.

Edit - To make things more clear, I just want to be pointed in the right direction on how to make an html parser to display a gui.

you can’t use html on roblox

I have seen people use html parsers and I am wondering how I could make one myself.