# Keeping Up with HTML

HTML grows a little every few months, so learn where its rules are written, how MDN and Baseline tell you whether a feature works in every browser, and how to use a new feature without leaving anyone behind.

![Codey's cheat sheet for Keeping Up with HTML: HTML grows a little every few months, so learn where its rules are written, how MDN and Baseline tell you whether a feature works in every browser, and how to use a new feature without leaving anyone behind.](https://fsdtrainingmedia.blob.core.windows.net/public/images/2026/10/b1f4b27c776042cda05a1ec13c4e79ac.webp)

- Category: HTML
- Level: Journeyman
- Tags: Baseline, html, Obsolete feature, Progressive Enhancement
- Updated: October 31, 2026

Source: https://www.ask-codey.com/cheat-sheets/html-keeping-up-with-html-cheat-sheet