Since Angular elements are packaged as custom elements the browser support of angular elements is same as custom elements support.
This feature is is currently supported natively in a number of browsers and pending for other browsers.
Browser Angular Element Support
Chrome Natively supported
Opera Natively supported
Safari Natively supported
Firefox Natively supported from 63 version onwards. You need to enable dom.webcomponents.enabled and dom.webcomponents.customelements.enabled in older browsers
Edge Currently it is in progress
