Accessibility as described in the WCAG actually makes your site better for everyone. Just doing the right thing, leveraging HTML5, and using a good third-party toolkit will get you most of the way there.
Error NG8001 flags when there is an unknown element or component in your Angular code. Here are some of causes, solutions and steps to prevent such an error.
Learn about Angular constructors and how they can help with dependency injection, setting default property values and running other initialization code.