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Same here; I stumbled on HTML for the first time in the '90s. I started with HotDog from the CDs that came in the magazines. https://brajeshwar.com/2024/hotdog-sausage-software/

Similar - I learned HTML by tweaking ReadMe.htm that was included with Dweep videogame from (now defunct) Dexterity Software.

I still remember sitting in my school library being blown away by framesets the first time I saw them.