Added a11y semantic landmarks for main and sidebar panels #3009
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This PR adds two important accessibility semantic landmarks for
sidebarPanel()andmainPanel()for assistive technologies to recognize each region systematically.I have confirmed that this improves screen reader navigation very positively for Shiny apps.
FYI, this addition does not break any visual aspects at all (just meant to provide assistive technologies with semantic info).
The detailed specs are as follows:
a11y semantic landmark for main content region
a11y semantic landmark for sidebar region