Web Address Dialog Box - Clickable area
These option buttons let you specify what area of the object must be clicked on to fetch the URL. There are two choices:
Object shape The user must click on the exact shape of the object to fetch the URL
Rectangle surrounding object The user can click anywhere in the rectangle surrounding the object (the bounding box) to fetch the URL.
The 'default clickable area' is the value that is shown in the Web Address dialog when there is no Web Address attribute on the selection. If the selection consists only of text, the default clickable area is Rectangle surrounding object. Otherwise, the default clickable area is Object shape. The Object shape option is fairly straightforward (only clicking on the exact object shape will fetch the URL).