now I wont to make a button witch hides all the non-imprtant elements.
<!--- .... -->
So I found solutions:
Important:: the solution should hide all 'notImportant' even if they are newly added, (and be easily reversible)
what would be the best (/fastest/most efficient /...) solution? or what are the pros and cons from my posibilitys? Are there othter ways to do this?