You can't tab from the edit summary box to the "Save page" button, or the reference inspector to the "Apply changes" button, etc.
This is important for accessibility. Currently, there is no way to confirm the action using only the keyboard.
Version: unspecified
Severity: enhancement
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=50897