- From: Alastair Campbell <acampbell@nomensa.com>
- Date: Tue, 14 Nov 2017 23:05:25 +0000
- To: "Bailey, Bruce" <Bailey@Access-Board.gov>, WCAG <w3c-wai-gl@w3.org>, Joshue O Connor <josh@interaccess.ie>, "Repsher, Stephen J" <stephen.j.repsher@boeing.com>
- Message-ID: <DB6PR0901MB0919DB080DA04901BEE3DD8DB9280@DB6PR0901MB0919.eurprd09.prod.outlook.>
Hi Bruce, Based on previous comments that we worked around, I can see a few issues: * It would need to be the "visual indicators of user interface components", otherwise the button/input itself must have contrast (I'm not actually sure what bit within a control would need the contrast?). * 'Provided' doesn't cover the same scope as 'required for understanding', and without that graphics/icons with text next to them would be in scope (and shouldn't be). There isn't a concept in WCAG 2.0 for what we need here. * We have some examples of things I don't think fit into the exceptions and need an 'essential' exception: Gradient graphs (like heat maps) where the colour is mapped to a scale and smoothly transitions. Also, medical tests / diagrams where it has to be certain colours to match reality, and screenshots where changing it would then not represent the thing you've copied. Note that I had also started with 1.4.3 & 1.1.1 exceptions (possibly at your suggestion?) and then iterated to what we had pre-TPAC. I also went over the comments and came to this version, leaning more on the essential exception and assuming lots of examples in the understanding: The visual presentation of non-text content has a contrast ratio of at least 3:1 against adjacent color(s) for each of the following - Controls: Focus indicators, and visual information used to indicate state for active user interface components - Graphical objects: Parts of graphics required to understand the content Except when a particular presentation of the graphic is essential to the information being conveyed. Cheers, -Alastair From: Bailey, Bruce I do not expect to make the call tomorrow. I took a stab at 1.4.11 and put it into the discussion tab on the wiki page for the comment summary on 1.4.11. http://www.w3.org/WAI/GL/wiki/Talk:Comment_Summary_1-4-11 I closely tracked 1.4.3, substituting "non-text content" for "text and images of text" and added the Sensory exception from 1.1.1. I used only terms and phrasing that are already in 2.0. The "provided for understanding and operating" comes from 1.3.3. Here it is below: 1.4.11 Graphics Contrast: The visual presentation of focus indicators, user interface components, and parts of non-text content provided for understanding and operating the Web page have a contrast ratio of 3:1, except for the following: (Level AA) * Incidental: Inactive user interface components, or those that are not visible to anyone, have no contrast requirement; * Logotypes: Non-text content that is part of a logo or brand name has no minimum contrast requirement; * Sensory: Non-text content that is primarily intended to create a specific sensory experience has no minimum contrast requirement.
Received on Tuesday, 14 November 2017 23:05:53 UTC