I think you can use metadata to model html attributes but in clojure people are using plain vector for that. https://github.com/weavejester/hiccup

tl;dr first element of the vector is a tag, second is a map of attributes test are children nodes:

[:h1 {:font-size "2em" :font-weight bold} "General Kenobi, you are a bold one"]

Also Hickory。。

https://github.com/clj-commons/hickory

i feel hiccup indexed based magic is a common design pattern you see in early Clojure and its less common now (id say hiccup is the exception that lives on)