# querySelector()

A DOM method that returns the first element matching a CSS selector.

## What does **querySelector()** do in JavaScript?

**querySelector()** — A DOM method that returns the first element matching a CSS selector.

```javascript
const button = document.querySelector("#checkout");
```

Level: Journeyman · [More JavaScript terms at this level](https://www.ask-codey.com/glossary/subjects/javascript/journeyman)

Updated: September 27, 2026

Source: https://www.ask-codey.com/glossary/queryselector