How we checked
Fact-check log
Every fact on this site is written in our own words and was checked on 14 November 2026 against the article body of a named MDN page. Wikipedia is not used as a source. Where a sample assistant reply is shown, it was written for the lesson; it is not a live result from an AI tool.
- MDN pages were read on 14 November 2026. Links on the sources page go to those articles.
- We quote and check against the article body, not any AI-generated summary that may appear on the page.
- The site teaches lasting skills (reading, testing and checking) rather than any one product, and should be reviewed again every few months.
A site that needs regular review
AI tools change often. This site teaches lasting skills (reading code, testing it, and checking it) rather than any one product. The facts were checked against MDN on 14 November 2026 and should be reviewed again every few months.
Sample assistant replies
The "assistant" replies on this site were written by us for the lesson. They are not live results from an AI tool, and nothing you type is sent to one. That way every visitor sees the same lesson.
Our drawings
The drawings on this site are our own. They are simplified and not to scale, and they are not screenshots of a particular editor or AI tool.