(Accessibility) Visualizations/Dashboards overrely on aria-hidden

[myasonik]

Summary

Just about every visualization is wrapped in an div with aria-hidden="true"

Why it's a problem

This has a couple of negative effects:

• sighted screen reader users will see huge swatches of the page that they're unable to navigate
• non-sighted screen reader users can get stuck focused on a element that's hidden so it won't read out anything
  • if we combat this problem with disabling focus, now people can't navigate with a keyboard and have no indication of where they are on the page

What to do

Rip it all out

[elasticmachine]

Pinging @elastic/kibana-app (Team:KibanaApp)