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Proposed wordsmithing for Contrast (Minimum) on interactive elements

From: Glenda Sims <glenda.sims@deque.com>
Date: Fri, 11 Nov 2016 08:48:55 -0600
Message-ID: <CAH2ngEQcTxS4a8iKbBwKqZ3xRYReMe1qcCsQVL85a=Q79HfkxA@mail.gmail.com>
To: public-low-vision-a11y-tf <public-low-vision-a11y-tf@w3.org>
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.
Received on Friday, 11 November 2016 14:49:28 UTC

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