Nodette guides you through The DOM Forest. Standing in the way: The Event Bubbler — every mistake this lane teaches you to avoid. Select, create and rewrite the living page. Listen for clicks, keys and everything users do.
All 21 lessons below are free, need no signup, and each one opens as a comic issue with a live try-it sandbox, a task list that pays XP, and a narrator that reads it aloud. Progress is stored in your own browser — nothing is uploaded anywhere.