Docs: add focus visible outline to navbar's nav links and toggler #39825
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Description
This PR adds a focus visible outline to navbar's nav links and toggler. The outline is the same as the one used when focusing the navbar brand logo for consistency.
Thix fix only works for Chrome and Firefox. Safari's navbar brand and skip links focus visible already have a contrast issue in the main branch; the outline rules not being handled the same way by the browser.
Motivation & Context
In our current documentation, it's almost impossible to see the focused items in the navbar when navigating with the keyboard.
Before:
Type of changes
Checklist
npm run lint
)Live previews