Cognitive WCAG 2.0 Extension - Scrolling text over fixed background

Hello, 
 
I would like to propose considering "scrolling text over fixed
background" for WCAG Principle 2 Operable  (i.e. scrolling text  in a
page based on fixed background).
 
Description: 
- Web page designed with a fixed background image on which content
displays over can cause major discomfort and distraction for users and
make them unable to navigate within the page. 
 
Scenario: 
- User scrolls vertically, in a page with fixed background image using
the browser vertical scroll
- The text scrolls over a fixed background image
- User feels discomfort and not able to focus on scanning the text due
to the motion ( may be related to cognitive disability?). The discomfort
increases with other facts such as contrast between text and background
image.
 
WCAG 2.0 Failure: 
I analyse the behaviour related to WCAG 2.0 Principle 2: Operable
however it does not fit into any of the current success guidelines or
success criterions. 
(for instance It could not be related to 2.2.2 Pause, Stop, Hide  or
any of the 2.3 Seizures since it is not an animated or flashing content
by default.) 
However the scrolling act makes the whole page animated and can cause
the same consequences. 
- Related failures include WCAG 1.4.3 Contrast 
Thank you,
 
 
Rabab Gomaa
Web and Form Services | Services Web et des formulaires
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Canadian Food Inspection Agency | Agence canadienne d'inspection des
aliments
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Rabab.Gomaa@inspection.gc.ca
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