No one to help me with this?
Or at least maybe give me another forum subject speaking of something similar? 
I read the whole ionic doc, however difference between css and js ionic component use cases can be fuzzy 
In code examples, we often see the two methods and it’s often working whichever way
Am I the only one wanting dynamic app header (button, form, text, …) depending on the view but the same abstract layout (in this case the same side-menu)? sort of sub-layout? 
Thanks in advance 