tree b15e59374a5d7df081a58a65d5e1d5fb698d1470
parent 1a606bee74ab53f2d9c18b38bbc637620260799b
author Yoshie Muranaka <yoshiemuranaka@gmail.com> 1558537372 -0500
committer Gunnar Mills <gmills@us.ibm.com> 1559137739 +0000

Fix the tabbing order in the primary and secondary navigation

The main navigation will follow a natural tabbing order.
When the secondary menu is expanded with the keyboard, the
first item in the secondary menu will be in focus.
Tabbing after the last item in the secondary menu will return
focus to the primary menu.

- Restructures markup so secondary menu is nested in primary
  navigation

Signed-off-by: Yoshie Muranaka <yoshiemuranaka@gmail.com>
Change-Id: I4ecb17ef6721ee443310f81e1554620352c145a4