understanding sections for 2.1

Hi folks

We have until Tuesday to the understanding sections for the success cryteria  we have put into the next WCAG draft.
We should  add use cases and explain why they are important. and add techniques.


See https://docs.google.com/document/d/13hmoaVU563kTio1EZD5mbNxcc0k924qVdZZwWckcbu0/edit#


(I have copied and pasted the information found in the issues on github)


All the best

Lisa Seeman

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