HTML & CSS · Document Structure · Lesson 3 of 25
Semantic HTML
Concept
Semantic HTML
Tags like header, nav, main, and footer describe what content means, not just how it looks, which helps accessibility and SEO.
A screen reader user can jump straight to <main> or <nav> by name — something that's impossible when every section of a page is just an unlabeled <div>.
- Explain the core idea behind Semantic HTML.
- Predict output before running a change.
- Test one realistic and one unusual input.
- Use the result to make the next decision.
- 1. Read one concept.
- 2. Change the example.
- 3. Run, compare, and explain.
- 4. Complete the challenge below.
Self-check before continuing
Without looking at the example, describe what changes when you modify one input in Semantic HTML. Then reopen the editor and prove your explanation with a small test.
You are ready to continue when you can predict, test, and explain the result.
Your turn
Rewrite a page using semantic tags instead of generic div elements.
Ask about this lesson or your next move. The guide explains the path without taking the work away from you.
Ready for the next lesson?
Mark this lesson complete when you have finished the exercise.
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