See http://blog.teamtreehouse.com/create-custom-html-elements-2 for a quick introduction.

Support status: http://caniuse.com/#search=custom%20elements

Full documentation: https://www.w3.org/TR/custom-elements/

Ember and custom elements: https://guides.emberjs.com/v2.7.0/components/defining-a-component/

 

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