Use Case #3

 Using a screen magnifier, it is very difficult for a person with corneal
dystrophy
<https://www.w3.org/WAI/GL/low-vision-a11y-tf/wiki/Types_of_Low_Vision#Corneal_Dystrophies_and_Degeneration>
to perceive error messages or other actions such as expanding menus when
they occur outside of the usable magnified viewport area. The person tries
to click around and nothing works. The problem could be solved if the
proximity of changes on the screen was close to where the action happens
e.g. inside the usable viewport area. When changes occur on screen, they
could be grouped together centrally. [Laura]
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this is difficult. the author/browser does not know that a screen magnifier
is in use. the author/browser does know know the location of the users
magnified viewport.

Perhaps, if the user were using cursor browsing error messages and other
alerts could appear centered on the cursor. The browser should know the
cursor location and where to place the message box.  Generally they appear
in the center of the screen (a known location).
​could be a browser user preference. ​

-- 
[image: http://www.tsbvi.edu] <http://www.tsbvi.edu>Jim Allan,
Accessibility Coordinator
Texas School for the Blind and Visually Impaired
1100 W. 45th St., Austin, Texas 78756
voice 512.206.9315    fax: 512.206.9264  http://www.tsbvi.edu/
"We shape our tools and thereafter our tools shape us." McLuhan, 1964