Why can't you create Custom Elements in Chrome Extensions?

Question

I attempted to create a custom element in a Chrome extension but customeElements.define is null.

customElements.define(\'customElement\         


        

Answer 1

As of now custom element can be used in chrome extensions UI. In Popup ui, option page ui and in the content script as well But it requires a polyfill which is this. https://github.com/GoogleChromeLabs/ProjectVisBug - this is the one big custom element in the chrome extension.