- From: Wayne Dick <wayneedick@gmail.com>
- Date: Mon, 10 Apr 2017 10:40:35 -0700
- To: public-low-vision-a11y-tf <public-low-vision-a11y-tf@w3.org>, GLWAI Guidelines WG org <w3c-wai-gl@w3.org>
Received on Monday, 10 April 2017 17:41:09 UTC
This 2.1 project has reached a breaking point for the old notion of one SC for all technologies. The idea is not to drop technology independence, but to expand it to fit things like geometric reality. Screen size is so significant that SCs relating visual interface really need a concept like "break point". Developers certainly do not treat mobile phones like desktops. There are things you do not do on a small screen. Few people write code on a mobile phone. People with low visual acuity will probably read very little on a mobile phone. It does not make sense to treat tiny screens like big screens when we are discussing visual accessibility. We need a concept like "technology agnostic where appropriate". Or a concept like break points for size. Consider font size. There are two factors to consider. Screen size S and viewing distance D. If font size of s at distance d that is sufficient then 3/4(s) at 3/4(d) will also be sufficient. So we need a break down for testable prescriptions: Screen Size Viewing Distance Font-Size % of Height/Width s0 to s1 d0 to d1 f1 s[n-1] to s[n] d[n-1] to d[n] fn Note that the Font-Size percent can be computed using pixels using breaks points. This construct could be used for target size as well.
Received on Monday, 10 April 2017 17:41:09 UTC