# Interpolation

Working out the in-between values of an animation.

## What is **interpolation** in CSS animation?

**Interpolation** is working out the in-between values of an animation, like the colors between blue and green.

```css
.bar { transition: width 1s; }   /* the browser interpolates every width in between */
```

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

Updated: September 27, 2026

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