RE: minimum target size for mouse

Ø  Just a quick touch-back regarding "pixel". Is the TF aware of this research/problem:

Yes, we are absolutely aware.  From some discussions we had – at least on mobile web – CSS pixels are rendered as device independent pixels – or at least that is our understanding – and regardless of screen density on the web 44px should be the same.  Obviously different physical devices have difference sizes and within native apps pixels may be treated different by the platform.

Jonathan

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From: John Foliot [mailto:john.foliot@deque.com]
Sent: Thursday, April 21, 2016 12:31 PM
To: David MacDonald
Cc: public-mobile-a11y-tf@w3.org
Subject: Re: minimum target size for mouse

Hi David, MATF,

Just a quick touch-back regarding "pixel". Is the TF aware of this research/problem:

  *   A pixel is not a pixel is not a pixel - http://www.quirksmode.org/blog/archives/2010/04/a_pixel_is_not.html

  *   PPK's video on the same topic: https://www.youtube.com/watch?v=4wscVOXjIzQ

  *   A Pixel Identity Crisis: http://alistapart.com/article/a-pixel-identity-crisis

FWIW

JF

On Thu, Apr 21, 2016 at 11:17 AM, David MacDonald <david100@sympatico.ca<mailto:david100@sympatico.ca>> wrote:
The feeling of the the mobile task force is that our touch size SC should include a minimum size for a pointer/mouse target in addition to touch. We're not sure what that minimum should be, whether it should be the same 44px as the touch or smaller. It was the end of the call so were were not able to flesh this out sufficiently... Os I'm creating a discussion here. If there is momentum I'll set up a WIKI page. There is some discussion about how would the author know the what is activating the control on responsive sites that share icons for touch AND pointer. The current wording is.
2.5.4 Target Size: A touch target<https://w3c.github.io/Mobile-A11y-Extension/#def-touch-target> is at least 44px by 44px of the visible display at the default viewport size. (Level AA)
What about this amendment, If it's an ok construct, then what value should be for the pointer minimum size.
2.5.4 Target Size: A touch target<https://w3c.github.io/Mobile-A11y-Extension/#def-touch-target> is at least 44px by 44px and the pointer/mouse target is at least <x pixels> by <y pixels> of the visible display at the default viewport size. (Level AA)



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John Foliot
Principal Accessibility Consultant
Deque Systems Inc.
john.foliot@deque.com<mailto:john.foliot@deque.com>

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