Andrea Fercia 3578f89900 Accessibility: Improve the way Internet Explorer 11 and JAWS announce fieldset legends. ...

When Internet Explorer encounters a non interactive element with a `tabindex`
attribute, it adds the element to the accessibility tree with a `role=group` and
an accessible name computed from the element. This prevents JAWS from announcing
any fieldset legend within the element.

- removes `tabindex="0"` from the content and the toolbar containers: these tabindex attributes are no longer needed
- removes `aria-label="Main content"` from the content container: not needed
- keeps the media modal focus fallback introduced in [38142] by making the `#wpbody-content` element focusable only when needed

Props stevefaulkner, aardrian.
Fixes #43154.

Built from https://develop.svn.wordpress.org/trunk@44639


git-svn-id: http://core.svn.wordpress.org/trunk@44470 1a063a9b-81f0-0310-95a4-ce76da25c4cd

2019-01-17 11:55:51 +00:00

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