Thread Subject: Re: 21(k) and 22(j) Flashing and blinking
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From: Hoffman, Allen
Date: Tue, Jan 16 2007 5:10 PM
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Andi Snow-Weaver wrote:
"
When we discussed 21(k) and 22(j), we liked the idea that WCAG 2.0
defines a minimum size area of flashing that is subject to the
prohibited frequency range. A blinking text caret, for example, is too
small to cause a problem no matter what frequency it it blinking at. But
we never discussed an actual proposal.
How about this for 21(k) (software):
When software has flashing or blinking elements that occupy more than
one quarter of any 341 x 256 pixel rectangle anywhere on the displayed
screen area when viewed at 1024 x 768 pixels, the flashing or blinking
elements shall not have a flash or blink frequency greater than 2 Hz and
lower than
55 Hz.
and this for 22(j) (Web)
When Web pages have flashing or blinking items that occupy more than one
quarter of any 341 x 256 pixel rectangle anywhere on the displayed
screen area when viewed at 1024 x 768 pixels, the flashing or blinking
items shall not have a flash or blink frequency greater than 2 Hz and
lower than 55 Hz."
This seems too specific to only one resolution.
I would like to get this provision to be more programmatically testable
if possible. Any ideas?
Allen Hoffman
DHS Office on Accessible Systems & Technologies.
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