Short, beautifully written courses on the things you keep meaning to learn. Read them top to bottom — or skip straight to the exam if the topic is already in your head. Either way, pass and you earn a verifiable badge.
The language the web is written in.
Landmarks, headings, and the elements browsers ship for free.
Inputs, validation, dialogs — forms the browser does most of for you.
Images, video, audio, tracks — the responsive media story.
Sit down with a course. Most finish in a single afternoon. No signup needed. Skip this step if the topic is already in your head.
Sign up first. 20 questions, 25 minutes, 90% to pass. Fail and the exam locks for a cooldown before you can retake.
A real certificate, verifiable by URL. Share it where it counts.