# Custom element

An author-defined HTML element whose behavior is registered through the Custom Elements API.

## What is **Custom element**?

**Custom element** — An author-defined HTML element whose behavior is registered through the Custom Elements API.

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

Updated: September 27, 2026

Source: https://www.ask-codey.com/glossary/custom-element