Lesson 1 of 27

What JavaScript is

JavaScript makes pages interactive — it responds to clicks, changes content, validates forms and talks to servers. HTML is structure, CSS is style, and JavaScript is behaviour.

It runs right in the browser. Here it changes the heading when you click.

See it run — click the button:

Try it Yourself

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Result

Key points

JavaScript adds behaviour to a page.
It runs in the browser — no reload needed.
HTML = structure, CSS = style, JS = behaviour.

Your turn: change the new text to your own message.

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