XF 2.1 CLS - reserve banner space for almost all users

stanleyb23

Member
When i ad an ad in options-advertising and create a div with for example a 728x90 ad and serve that ad to almost all users exept one usergroup.
And in my css I ad styling dimensions 728x90.

Is that enough to not have a cls issue?
Or is that still creating content shift / content movement.
 
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