# Customized built-in element

A custom element that extends a built-in HTML element and uses the is attribute.

## What is **Customized built-in element**?

**Customized built-in element** — A custom element that extends a built-in HTML element and uses the is attribute.

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/customized-built-in-element