What does it mean that Ionic became framework-agnostic?

Since its creation, Ionic had been dependent on Angular framework components, as a tool for Angular users. With the fourth version, Ionic became framework-agnostic, meaning its independent of Angular. The change was made possible thanks to the utilization of web components and the promotion of Ionic’s CLI.

Web components are sets of features that use standard APIs natively supported in nearly all mobile browsers today. Thus, those can be deployed on any mobile platform or used to create desktop apps with Electron framework, or PWAs. The usage of web components also allows for the utilization of any frameworks with Ionic.