Tabs - Clicking a Tab should allow the user to start using keyboard navigation

[SiTaggart]

I think the markup is out of date, which is why this is happening.

Each tab has 2 focusable elements; the list item and it's nested anchor.

For keyboard navigation the list item is wired up to be the tab which get's aria-selected and listens to key events.

A mouse user will click the tab, but because it has a nested anchor element, the anchor takes the users focus, which has no semantic meaning and does not respond to key events.

If you match SLDS markup this should go away