# Query container

An element whose size its contents can query.

## What is a **query container**?

A **query container** is an element marked with `container-type`, so the elements inside can ask about its size.

```css
.sidebar { container-type: inline-size; }
```

Level: Freelancer · [More CSS terms at this level](https://www.ask-codey.com/glossary/subjects/css/freelancer)

Updated: September 27, 2026

Source: https://www.ask-codey.com/glossary/query-container