Re: Testability of Animation from interactions Issue 18

​​
​
I have to admit that I've never failed
​a web site
on
​"​
2.3.1 Three Flashes or Below Threshold
​. Perhaps its because until recently I evaluated mostly boring corporate
sites and not Pokemon videos, I don't know... but when testing I look for 3
flashes within 1 second rather than using the
 general flash and red flash thresholds
<https://www.w3.org/TR/WCAG20/#general-thresholddef>
​ measurement tool​.

​

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On Wed, Jan 11, 2017 at 4:08 AM, Patrick H. Lauke <redux@splintered.co.uk>
wrote:

> On 11/01/2017 05:04, Gregg C Vanderheiden wrote:
>
>>
>>
>> On Jan 10, 2017, at 6:46 PM, Patrick H. Lauke
>>> <redux@splintered.co.uk> wrote:
>>>
>>> I'm failing to see why the "33% of any 10 degree visual field on
>>> the screen" has the issues (1 and 2) you noted, but the existing
>>> ".006 steradians within any 10 degree visual field on the screen
>>> (25% of any 10 degree visual field on the screen) " from WCAG 2.0's
>>> current definition for general flash and red flash thresholds
>>> doesn't?
>>>
>>> Does "visual field on the screen" not, in essence, mean the full
>>> size of the screen/viewport? And if not, isn't the general
>>> flash/red flash definition not also fundamentally flawed as it
>>> can't take into account physical screen size / viewing distance /
>>> etc, regardless of the existence of a "tool"?
>>>
>>
>> Hi Patrick
>>
>> I said that it DID have the same problems — and worse. But there was
>> a tool that did the measurement automatically — so no one had to
>> figure out the bits.
>>
>
> So you'd agree that rephrasing both the general flash and red flash
> measurement in WCAG 2.0 and the proposed animation measures as something
> more in the format "1/3 of the viewport" (or whatever the most appropriate
> fraction of the visible viewport works best / approximates the existing
> "25% of any 10 degree visual field on the screen") or similar would be
> possible? Doing that would demystify the baffling measurement. If there's
> then also a tool that helps with the calculations, even better, but it
> would make the measurement as written in the spec a lot less obscure.
>
> And I suggested you might look at that approach here too.   And gave
>> other advice that related to the flash work.   Read my comments
>> again.  Maybe I didnt write them clearly enough.
>>
>
> I think I initially talked across purposes https://lists.w3.org/Archives/
> Public/w3c-wai-gl/2017JanMar/0160.html ... apologies.
>
>
> P
> --
> Patrick H. Lauke
>
> www.splintered.co.uk | https://github.com/patrickhlauke
> http://flickr.com/photos/redux/ | http://redux.deviantart.com
> twitter: @patrick_h_lauke | skype: patrick_h_lauke
>
>