A comment is a note in your code for people, not for the browser. HTML comments start with a bracket, an exclamation mark and two dashes, and end with two dashes and a bracket. The browser does not show anything inside a comment, so coders use comments to explain their code or to switch a line off for a while. Anyone can still read comments by viewing the page source, so never put passwords in them.
Hidden notes — “anything inside a comment is not shown on the page”
A comment is <!-- note -->: it starts with <!-- and ends with -->.
Anything inside a comment, even a whole <p>, is not shown.
Comments can be read with “view source” — never put secrets in them.
Use it for: Leaving notes in your code, hiding a line while testing, and reading other people’s code.
Worked example: 💬 How many paragraphs show on the page?
<!-- <p>Cricket is fun.</p> -->
<p>Our school trip</p>
<p>Fun facts</p>
<!-- <p>My best friend</p> --> → 2
4 paragraphs are written, but 2 are inside <!-- -->.
4 − 2 = 2 paragraphs show.
Check: Only “Our school trip” and “Fun facts” show ✓
Work it out in your head or on paper, then tap your answer — or type it and press Check. Stuck? Press “Show me how”.
Right: 0 · Tried: 0
🏁 Lesson 9 test
20 questions. Check each answer, then go to the next one. Get 16 or more right to pass.
🏅 Sign in with Google to earn the
💬 Comment Whisperer badge when you pass — and a certificate when you finish all 10 lessons of
Part 1 · HTML Basics. You can still take the test without signing in.
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