Here we control the behaviour of an ad that is smaller then the ad slot and the loading behaviour of the vertical slot.
The vertical slot is only rendered when it is 100% visible. Whether there is enough space, and if so, for what width of the vertical, depends on the width of the browser window, and also on how wide the content area is.
And it is exactly this width of the content, including the spacing on the left and right, that we have to specify here in the ATF Manager.
How to determine the width exactly can be seen in the following screenshot using http://haus.de as an example. To do this, we need the Examine tool in the Dev Tools and search for the container whose name and dimensions are displayed in the top left corner in the example. At the same time, we see the size visually marked in colour.
Depending on how much space is available on the right, either no vertical at all, a skyscraper with 120x600, 160x600, 200x600, or even a 300x600 HPA and a dynamic sitebar ad can be displayed.