Glossary

Autonomous Custom Element

This is likely what folks are referring to when they say "custom element". Autonomous custom elements implement behavior "from scratch".

This type of custom element is similar to:

• React Components
• VueJS Components
• Angular 1.x Element Directives

Example

<my-stuff></my-stuff>
<x-foobar></x-foobar>

Customized Built-in Element

These elements extend functionality of native elements, like <button>.

NOTE: There is currently no support for these types of custom elements in ANY browser.

Example

<button is="fancy-button">Fancy Button</button>