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Take a very close look at this markup:

I have added a second unordered list inside the ?¬? rst list item, which
is highlighted; this is the drop-down menu. Note exactly where it
is placed??”right before its parent list item closes. Observe how the
closing element of the top-level list item follows the entire secondlevel
list. You have to get this organization right or your menu won??™t
drop down. Let??™s take a look at how this arrangement displays.
FIGURE 6.43 At this point, the only
styling on the drop-down is inherited
from the horizontal top level menu,
so the drop-down??™s list items line up
horizontally, too.
Because we haven??™t written any speci?¬? c styles for the drop-down
yet, the drop-down, simply inherits the styles from the top level and
aligns itself horizontally, as you can see from Figure 6.43. Of course,
in order for it to be a drop-down menu, we need it to stack vertically
instead. The way to do this is to create the absolute/relative
positioning relationship between the two levels of the menu that we
have seen several times by now.


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