2020 Accessibility chapter

[oluoluoxenfree]

Progress on #907

[rviscomi]

Thanks @oluoluoxenfree! I'll mark this PR as a draft while the rest of the markdown is converted. Please mark it "ready for review" when the conversion is complete.

[rviscomi]

@oluoluoxenfree I've pushed a change to this branch to fix up some of the figures, giving them the correct semantic markup. There are some TODOs in there for you to resolve as well.

All, please pitch in if you can and suggest changes or push them directly to the branch. We need to get this markdown completed and submitted by the end of the day to be published in the morning.

[aardrian]

"Groups of form controls such as a set of radio inputs or checkboxes should be nested as the first child within a <fieldset> element and given a group label via the <legend> element within the <fieldset>."

The <legend> should be the first child, not the fields.

This may be my fault, since I explained it and missed it on review. Maybe dump the first child reference altogether.

[aardrian]

I left notes throughout.

This looks great overall. Thrilled to see how it came together.

[foxdavidj]

@oluoluoxenfree looking through the document, I'm not seeing any indications of what charts and graphs you'd like to display from our analysis, and where you'd like them.

Can you go back through the document and put the following wherever you'd like a figure?

{# TODO: <Description of figure you'd like to display> #}

[aardrian]

I think I did it correctly this time.