Don’t just read
the DOM.
Make it come alive.
Select it. Change it. Make it respond. Learn how real interfaces work through 50 bite-sized builds—with code you can edit and results you can see.
'click', makeSomethingHappen
);
The browser does it. ↗
Your route to confident interfaces
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Start with basic HTML and JavaScript variables/functions. New to either? Practice HTML or JavaScript fundamentals first. Go in order or jump to the concept you need.
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Need a nudge? Open a hint
See the starting HTML
Runs in an isolated preview with network access blocked by its content policy. Use learning code only; an infinite loop may still freeze a browser tab. Stop replaces the preview when the browser remains responsive. Checks cover the stated tasks, not all possible behavior.
Take it further
See your code in action
Interact with the page after Run. Check my work uses a fresh page and performs the task’s test actions.
Live DOM explorer
Element nodes in the current preview. Updates after clicks and typing; refresh for other changes.
Run a lesson to inspect its tree.
Console & runtime messages
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Small experiments become real skills.
Progress means your current code passed the authored checks and you answered the concept question. Worked-example passes are labeled separately. Use the stretch tasks to make the result your own.
No account or AI service. Drafts and notes stay in this browser; storage can be cleared, so keep a backup. Your exported HTML runs your code outside the studio—review it before sharing.
DOM reference on MDN ↗ · Events on MDN ↗