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RE: CFC - Target Size (2 options)

From: White, Jason J <jjwhite@ets.org>
Date: Sat, 20 Jan 2018 00:17:08 +0000
To: Andrew Kirkpatrick <akirkpat@adobe.com>, WCAG <w3c-wai-gl@w3.org>
Message-ID: <DM5PR07MB297158135F5B2FC42A7EBB11ABEE0@DM5PR07MB2971.namprd07.prod.outlook.com>
-1 without specific reference to an “AND minimum rendered touch target size” (which is implied but unstated).  Neither option is satisfactory without it, though we find Option 1 the least objectionable. We know of (but can’t describe) implementations that meet the Option 2 criteria that would not result in a minimally usable user experience.



We note that in the current understanding, one test describes physically measuring the screen to ensure the target is at least 9 by 9 millimeters.



We also find the commentary that you can’t ask authors (or accessibility testers) to test that 44px by 44px really renders acceptably on every possible consumer device troubling. We need to remember that it is the consumer/user who is being inconvenienced when the device they choose (whether for economics, or other reasons) can’t render touch targets that are at usable size, even if the authored content is technically conformant.


From: Andrew Kirkpatrick [mailto:akirkpat@adobe.com]
Sent: Wednesday, January 17, 2018 11:29 PM
To: WCAG <w3c-wai-gl@w3.org>
Subject: CFC - Target Size (2 options)
Importance: High

Call For Consensus — ends Friday January 19th at 11:30pm Boston time.

The Working Group has discussed a change to the Target Size SC in response to public comments.

The proposed SC text (Option 1):

The size of the target for pointer inputs is at least 44 by 44 CSS pixels or is at least 26 by 26 CSS pixels with 8 CSS pixels spacing between targets except when:


  *   Equivalent - The target is available through an equivalent link or control on the same page that is at least 44 by 44 CSS pixels pixels or is at least 28 by 28 CSS pixels with 8 CSS pixels spacing between targets;
  *   Inline- The target is in a sentence or block of text;
  *   User Agent Control - The size of the target is determined by the user agent and is not modified by the author.
  *   Essential - A particular presentation of the target is essential to the information being conveyed
  *   Viewport size: The viewport size has a length (height or width) of at least 1000 CSS pixels.

The proposed SC text (Option 2) – this is identical to option 1 but removes the exception for viewport size.

The size of the target for pointer inputs is at least 44 by 44 CSS pixels or is at least 26 by 26 CSS pixels with 8 CSS pixels spacing between targets except when:


  *   Equivalent - The target is available through an equivalent link or control on the same page that is at least 44 by 44 CSS pixels pixels or is at least 28 by 28 CSS pixels with 8 CSS pixels spacing between targets;
  *   Inline- The target is in a sentence or block of text;
  *   User Agent Control - The size of the target is determined by the user agent and is not modified by the author.
  *   Essential - A particular presentation of the target is essential to the information being conveyed

Please indicate if you can:
Live with option 1 and not option 2
Live with option 2 and not option 1
Live with option 1 or option 2, but prefer option 1
Live with option 1 or option 2, but prefer option 2
Cannot live with either option 1 or 2


Thanks,
AWK

Andrew Kirkpatrick
Group Product Manager, Accessibility
Adobe

akirkpat@adobe.com<mailto:akirkpat@adobe.com>
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Received on Saturday, 20 January 2018 00:17:34 UTC

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