RE: More on not using Screen Magnification as an example

Jonathan makes several key critical points (e.g. focus tracking, label 
relationships) about the difference between screen magnification and 
screen magnifiers assistive technologies. 

Magnification is only one simple component of an AT screen magnifier like 
ZoomText with Speech (1) and MAGic (2)

Perhaps there isn't a clear understanding between the difference in terms 
such as: 
        browser zoom, 
        platform zoom, 
        hardware screen magnification, 
        and advanced capabilities and features 
of assistive technology (AT) screen magnifiers. 

Remember too that the web developer / author is only responsible for half 
of the solution, the platform +  browser + AT + end user settings are the 
other half. 
See http://www.w3.org/WAI/intro/components.php

1. http://www.aisquared.com/zoomtext/more/zoomtext_magnifier_reader/
2. http://www.freedomscientific.com/Products/LowVision/MAGic
____________________________________________
Regards,
Phill Jenkins, 
IBM Accessibility