HTML code FYI is for people who build their own websites and want to understand the code in front of them. A working example is a beginning. Knowing why it works is what helps when something goes wrong.

The focus is practical HTML, CSS and JavaScript, with approachable guides to debugging, accessibility, design and publishing. This is a growing, deliberately bounded collection rather than an exhaustive reference to every web technology.

My web journey

From hand-written pages in the 1990s to developing alongside AI in 2026.

Things I’ve built

Personal stories, photographic archives and experiments on the web.

The future of the web

A personal perspective on tools, independence and understanding.

Working with AI

How the project is made, and why checking still matters.

The person behind the project

I am Mario V.W.B.R. Obst. My experience connects website creation, visual communication and international digital communication. My professional background is presented on marioobst.com.

Questions or corrections: 42@html-code.fyi.