Andrea Fercia aef3839e7b Accessibility: Change the "Show details" links in the update core screen to buttons.
These controls toggle the visibility of the update progress: they perform an action
therefore they should be buttons. Also:
- uses `aria-expanded` to communicate the toggle button state
- removes some inline JavaScript
- when clicking the toggle buttons, the progress details get moved with JavaScript after the button: this helps users of assistive technologies in finding them and makes the UI a bit more intuitive

Props Cheffheid, afercia.
See #26504.
Fixes #40453.


git-svn-id: https://develop.svn.wordpress.org/trunk@40646 602fd350-edb4-49c9-b593-d223f7449a82
2017-05-11 23:50:01 +00:00
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