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1. The factory that Angular compiler generates uses createNgModuleFactory function which takes: module class reference; bootstrap components; component factory resolver … Angular 9 Web Components: Custom Elements & Shadow DOM Angular already knows to load these modules by default. mdb-icon is not a known element - Material Design for Bootstrap If you’re curios how you can create a component without any framework read Custom Elements v1: Reusable Web Components. p-message is not a known element - Prime Community Forum component Angular If 'mat-option' is a Web Component then add 'CUSTOM_ELEMENTS_SCHEMA' to the '@NgModule.schemas' of this component to suppress this message. But I get ERROR. If 'mi-accordion' is an Angular component, then verify that it is part of this module. I would suggest following Angular Style Guide (link not provided b/c they change) and use their folder structure suggestions and then make sure that you are using modules correctly. If 'mat-option' is an Angular component, then verify that it is part of this module. Angular 12 Ivy full compilation mode : 'XYZ component' is not a … icon is not a known element