alter aria-expanded attributes for popover invokers #77
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Native popover in Chrome exposes "expanded" accessibility info for popover invokers, which allows assistive technologies to know that the button will expand some kind of dialog or menu.
This PR adds
aria-expanded=false
on all popover invoker buttons that target anauto
popover, during page load or insertion into the DOM, and when a popover becomes visible, it will togglearia-expanded=true
for all invokers of a visible popover.