Updated understanding doc for graphics contrast

Hi everyone,

I’ve been in for a thorough overhaul of the Graphics Contrast understanding doc. A preview version is here:
https://alastairc.ac/tmp/graphics-contrast.html


The diff with a split view is here:
https://github.com/w3c/wcag21/pull/500/files?diff=split


There are a couple of images still to go in, I found some interesting icons to use, but I’m going to get one of our designers to re-create them so there are no copyright issues (and so they pass!). I think you can work out what they are from the notes, my aim was to use them to describe what a graphical object is in different cases.

Within the intent section I’ve moved things around and added quite a lot, as an overview:

  *   Swapped the first two paragraphs so it starts with a stronger intent, and follows with the comparison to text contrast.
  *   Moved the ‘required for understanding’ section up, so it is clearer when it is needed.
  *   Extended the ‘graphical objects’ section with examples.
  *   Added ‘dynamic examples’ and ‘responsive graphics’.
  *   Called out the added border on the last pie chart.
  *   Updated the techniques, cut a few, and put them in sections.
  *   Removed all the ‘instructions’ boilerplate.

If there is any controversy I think it will be in my use of ‘gestalt’ principles to hand-wave over small overlaps (is that well known enough?), and possibly the section on dynamic content.

The bit that might need more explanation (but I couldn’t think how last night) was the responsive graphics bit.

Cheers,

-Alastair

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www.nomensa.com<http://www.nomensa.com/> / @alastc