This is for a web application, where the user is asked to accept the terms and conditions. Those license terms are displayed in a small window with the Accept button at the bottom. The full text does not fit the window, the user has to scroll down in order to read the full text. However on the Mac there is no visible scroll bar unless the user moves the mouse pointer over the text area. This means that a user may click "Accept" without reading the whole text or actually even knowing that this is not the whole text!
It this is a problem or considered a normal acceptable behavior?
If this slight ambiguity needs to be removed, what's the best way to handle it?
Some UIs won't enable the Accept button until the user has scrolled down the whole text, but we find this to be annoying.
What do experts recommend for this UI?