I was wondering if there are standard sizes which designers use when you want to reserve space for a web advert on their website design.
I'm aware of these sizes given by IAB http://en.wikipedia.org/wiki/Web_banner#Standard_sizes
Then there are also the Google Ad sizes. https://support.google.com/adsense/answer/6002621?hl=en
I want to know which sizes are most commonly used by Web Designers when reserving space.