myExtraContent1 (only enabled when style-switcher is
on)
myExtraContent2 (only enabled when clock bar is on)
myExtraContent5 (reserved for mega-menu navigation
option)
myExtraContent7
myExtraContent8 (only enabled when header search bar is
on)
myExtraContent9
myExtraContent10 (used for the content of a second
sidebar container)
myExtraContent11
myExtraContent12
myExtraContent13
myExtraContent15