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WCAG 2.0 SC 1.4.4 - Text Zoom Vs Browser Zoom

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From: Rakesh P
Date: Sep 16, 2014 2:24AM

Dear All,

We have a web application where content on the site is getting
restructured if we use global zoom to magnify the content.
In one of the page, there is a chart image with image hot spots
(functional links) as indicator of some chart value. When we do global
zoom, the entire chart (with image hot shots) is getting re-sized and
no distortion is happening. But with Text Zoom (using Text Zoom option
in Firefox browser), only the text is re-sizing and not the chart
image, so the position of image hot spots are getting distorted and
this will definitely create some difficulty for user using text zoom
(low vision user).
As per WCAG SC 1.4.4 (Text Re-size), the content of the page should
not be clipped, truncated or obscured with 200% Text Zoom.
We want to understand, in a scenario like this, where Global Zoom is
handled efficiently and doesn't cause any loss of information or
horizontal scroll, is it really required to handle distortion caused
by browser text zoom? Is the global zoom a sufficient way to execute
and test S.C 1.4.4?

Thanks & Regards
Rakesh Paladugula