We should consider that zooming in and our may be difficult for the group of people who need larger targets. Jon Sent from my iPhone > On Jan 18, 2018, at 2:50 PM, Patrick H. Lauke <redux@splintered.co.uk> wrote: > >> On 18/01/2018 19:09, Hakkinen, Mark T wrote: >> [...] >> I should have been clearer, I am not suggesting in any way that authors define size using the problematic CSS physical lengths. My question for this SC is: will 44 CSS Pixels result in meeting what research tells us should be a 10 mm (or 9 or 12) minimum physical size on any device from which the user is trying to select a target with their finger tip? I assume the answer is no. Larger is always better, we know that. Smaller on the other hand? > > In most cases, it results in a size that is, generally, near enough that particular physical size in most devices/OSs. > >> So, what's the point of this SC? Aren't we, for the user's sake, effectively mandating a minimum physical size? > > It's mandating a minimum CSS size which, in most cases, on most devices, gets close to a good physical size - give or take a certain degree of uncertainty. > > As the uncertainty can't be magicked away, it's the next best thing that can be mandated. > > If, instead, an SC mandated an actual physical size, it would make it impossible for authors to guarantee they're meeting the SC on all possible past, current and future devices/user agents. Ditto for testing. And if a new device came out which, for whatever reason, decided to have a different logical viewport dimension / CSS px to real-world physical measurement ratio, it wouldn't retrospectively make a pass now fail when tested on that device. > >> Agree. Let's not make this mistake. The only alternative I can think of is (quickly): All touch targets must have role, state, and name specified so that assistive technologies (or user agent features) can provide alternative selection methods (for example, enlarge target areas). > > role/state/values would already fall under 4.1.2. > > Not all users that require large-enough targets (note this isn't just touch, but also mouse) run AT. > > (But as noted, in the worst case users can zoom (as long as it's not suppressed) to make targets, and all other content, larger). > > -- > 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 >Received on Thursday, 18 January 2018 20:37:44 UTC
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