W3C home > Mailing lists > Public > public-low-vision-a11y-tf@w3.org > November 2016

Re: Proposed wordsmithing for Contrast (Minimum) on interactive elements

From: Alastair Campbell <acampbell@nomensa.com>
Date: Tue, 15 Nov 2016 09:06:00 +0000
To: Glenda Sims <glenda.sims@deque.com>, Jim Allan <jimallan@tsbvi.edu>
CC: public-low-vision-a11y-tf <public-low-vision-a11y-tf@w3.org>
Message-ID: <8A559D41-00C1-445B-9779-63F1A7A1AACA@nomensa.com>
Hi Glenda,

I was hoping we could keep it simple with regards to the thicker/medium aspects, as they are saying essentially the same thing.

If people didn’t understand ‘line’ to include border / indicators, could we say:

  *   thicker lines: where the minimum width of the stroke, border or indicator is at least 3px;

And drop the medium border/indicator?

For the “temporary exception”, this seems to be something that would apply across many SCs, including the current contrast ones and use of color.

Rather than putting it in one SC when it should apply to many, can we propose to add it to the conformance requirements? https://www.w3.org/TR/WCAG20/#conformance-reqs


Thanks,

-Alastair

From: Glenda Sims <glenda.sims@deque.com>
Date: Tuesday, 15 November 2016 at 04:36
To: Jim Allan <jimallan@tsbvi.edu>
Cc: LVTF - low-vision-a11y <public-low-vision-a11y-tf@w3.org>
Subject: Re: Proposed wordsmithing for Contrast (Minimum) on interactive elements
Resent-From: LVTF - low-vision-a11y <public-low-vision-a11y-tf@w3.org>
Resent-Date: Tuesday, 15 November 2016 at 04:37

Jim, Alastair, David, Jonathan Avila, et al

I agree!  I've just published (in the wiki) the David/Alastair version with some additional Goodwitch and Avila modifications.

Jonathan, I"m not clear on the intent of the 3 seconds for allowing temporary poor contrast.  Were you thinking 3 seconds "on load of a page"? Or were you thinking of 3 seconds "on scrolling".  I'm just now sure how the 3 seconds will work...I'm learning towards leaving out the temporary exception.

G

glenda sims    |   team a11y lead   |    deque.com<http://deque.com>    |    512.963.3773

web for everyone. web on everything. -  w3 goals

On Mon, Nov 14, 2016 at 10:20 AM, Jim Allan <jimallan@tsbvi.edu<mailto:jimallan@tsbvi.edu>> wrote:
Glenda,
I like the new wording with one exception. It is more concise and structured.
The exception is the phrase "A mechanism is available". Borders and focus is something the Author/Developer can fix. Until the browsers step up and fix the default presentation of the form borders, I think authors must fix the borders they can. To me "a mechanism is available" says the devs can say border contrast is a user problem and they can fix them with user style sheets or some other mechanism.
wording more in line with WCAG 1.4.3 would be better for me

Visual presentation of the following have a contrast ratio of at least 4.5:1 against the immediate surrounding background :

  *   important (non-text) information in an interactive image;
  *   input elements or the border(s) of input elements;
  *   focus and select indicators;
except for the following which have a contrast ratio of at least 3:1.

     *   disabled interactive elements;
     *   thicker lines: where the minimum width of the line is at least 3px;
     *   focus Indicators for an interactive logo image;


On Fri, Nov 11, 2016 at 8:48 AM, Glenda Sims <glenda.sims@deque.com<mailto:glenda.sims@deque.com>> wrote:
Oh wonderful LVTF,

David MacDonald and Alastair Campbell have closely reviewed the proposed WCAG SC for Interactive Element Contrast (Minimum) at https://www.w3.org/WAI/GL/low-vision-a11y-tf/wiki/Contrast_(Minimum)

And I think they have made a fabulous suggestion for rewording, that makes it easier to read (and understand) this proposed SC, while simulatenously maintaing all the of the meaning and intent.

The current (long winded) wording is:

1.    The visual presentation of important (non-text) information in an interactive image has a contrast ratio of at least 4.5:1 against the immediate surrounding background.
2.    The visual presentation of a disabled interactive element has a contrast ratio of at least 3:1 against the immediate surrounding background.
3.    The visual presentation of input elements or the border(s) of input elements has a contrast ratio of at least 4.5:1 against the immediate surrounding background, except for the following:
·   Medium Width Border for Input Elements: A medium width border (or wider) for input elements has a contrast ratio of at least 3:1 against the immediate surrounding background;
4.    The visual presentation of focus indicators and selected indicators has a contrast ratio of at least 4.5:1 against the immediate surrounding background, except for the following:
·   Medium Focus Indicator: Medium focus indicator has a contrast ratio of at least 3:1 against the immediate surrounding background;
·   Medium Selected Indicator: Medium selected indicator has a contrast ratio of at least 3:1 against the immediate surrounding background;.
·   Focus Indicator for an interactive logo image: Focus indicator for an interactive logo image has a contrast ratio of at least 3:1 against the immediate surrounding background.
The rewording proposed by David MacDonald & Alastair Campbell is:

A mechanism is available to ensure the visual presentation of the following have a contrast ratio of at least 4.5:1 against the immediate surrounding background :

  *   important (non-text) information in an interactive image;
  *   input elements or the border(s) of input elements;
  *   focus and select indicators;
except for the following which have a contrast ratio of at least 3:1.

     *   disabled interactive elements;
     *   thicker lines: where the minimum width of the line is at least 3px;
     *   focus Indicators for an interactive logo image;
I'm in 100% favor of changing the wording to what David/Alastair have proposed.  But before I do that, I wanted to give y'all a chance to give me feedback.  If you are in favor of this change, can you respond with +1?  If you are opposed...can you respond with a -1 and help us understand what you think would be better?

Thanks much,
G

P.S.  I'll hold off on making this change on the wiki until Monday Nov 14th at noon central time.


--
Jim Allan, Accessibility Coordinator
Texas School for the Blind and Visually Impaired
1100 W. 45th St., Austin, Texas 78756
voice 512.206.9315<tel:512.206.9315>    fax: 512.206.9264<tel:512.206.9264>  http://www.tsbvi.edu/

"We shape our tools and thereafter our tools shape us." McLuhan, 1964

Received on Tuesday, 15 November 2016 09:06:37 UTC

This archive was generated by hypermail 2.4.0 : Friday, 17 January 2020 16:23:23 UTC