RE: let's bump to 10mm from 9mm

Hi Patrick,

Just to clarify, I meant the default text size of the user agent (e.g. for <p>) before the author might decide to change it with CSS.

I like CSS pixels as a Sufficient technique, but if that's the SC wording then:
(1) it rules out other approaches (e.g. just using <button> and letting the UA do the sizing) and 
(2) it can cause problems with text resizing that wouldn't happen if a relative unit (e.g. em) was used.

Cheers,
Jan



(MR) JAN RICHARDS
PROJECT MANAGER
INCLUSIVE DESIGN RESEARCH CENTRE (IDRC)
OCAD UNIVERSITY

T 416 977 6000 x3957
F 416 977 9844
E jrichards@ocadu.ca

________________________________________
From: Patrick H. Lauke [redux@splintered.co.uk]
Sent: December-18-15 9:58 AM
To: public-mobile-a11y-tf@w3.org
Subject: Re: let's bump to 10mm from 9mm

On 18/12/2015 14:51, Richards, Jan wrote:
> What if we cued off of another size that could be determined in the content (eg. 3 times the height of capital letters in the default text)?

That would only work if there's a matching SC that requires default text
to be at a particular legible height. Which, once again, brings us right
back to the conundrum of authors not necessarily having direct control
over the exact physical size text is rendered on a screen.

I think the approach of defining a reasonable size in CSS pixels,
coupled with a note that clarifies authors may not be in full control as
it depends on the device/OS/UA to a certain extent, is a good one.

44px was suggested as that matches Apple's HCI guidelines, and I know
entities like the BBC have used that value too in their guidance for iOS
http://www.bbc.co.uk/guidelines/futuremedia/accessibility/mobile/design/touch-target-size
- though I see that for Android and "HTML" they've gone for slightly
different values.

But I'd say 44px gives a reasonable average size on most common devices.
If we feel like going bigger, 55px would also work for me...not
particularly married to any particular size here. Just that the approach
(that we use CSS pixels, and nothing like "put a ruler against the
screen" / physical size) must be sound.

P
--
Patrick H. Lauke

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Received on Friday, 18 December 2015 15:09:53 UTC