People who have upper limb disabilities or weak eyesight can have difficulty operating the scroll bar. Persons with weak eyesight sometimes magnify parts of the screen using the magnify tool. The magnify tool scroll and the browser scroll are doubled up, further complicating operation of the browser

Good example: 800 pixels including the window border
There are difficulties in grasping the content of pages which must have a diversity of up and down scrolling because they are lengthy. Persons who have upper limb disabilities or sight impairments can have difficulty with operating the scroll bar.

Bad example: lengthy page General 450 pixels

Good example: has some internal page navigation
Sites that are complicated by a large volume of content can cause time delays in finding necessary information for elderly and audio browser users.

Good example: provides a site map for sites with a large volume of information.
Sites that are complicated by a large volume of content can cause time delays in finding necessary information for the elderly and audio browser users.

Good example: displays a navigation