Site building · Website glossary

JavaScript

Quick answer · What is JavaScript?

A programming language widely used to add behavior to web pages and run application logic in other environments.

IN PRACTICE

JavaScript: an example

A directory filters already-rendered links when a reader enters a search term.

KEEP IN MIND

Critical content should remain reachable when scripts fail where practical; interactions need deliberate loading and error behavior.

Put the idea to work

Frequently asked questions

What is a practical example of JavaScript?

A directory filters already-rendered links when a reader enters a search term.

What should I plan for when scripts fail?

Critical content should remain reachable when scripts fail where practical; interactions need deliberate loading and error behavior.

Which concepts should I read alongside JavaScript?

Static website: A website primarily served from prebuilt files rather than generating each page's HTML on demand.
API: An application programming interface defines how software can request data or behavior from another component.