# Custom element content model

The rules governing which children are valid in an author-defined custom element.

## What is **Custom element content model**?

**Custom element content model** — The rules governing which children are valid in an author-defined custom element.

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

Updated: September 27, 2026

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