Failing to target intermediary defined CSS selectors

HTML

<div id="xwikicontent" ...>
    <div class="box infomessage ....>

The Tour fails to display the popover with the placement (bottom, top, etc.) if we call this selector:

#xwikicontent .infomessage

but only works if we call:

#xwikicontent .box

I guess the problem is that in the first example we are using an intermediate class, while in the last example is using the first defined class. So maybe from a performance pov is not parsing the whole classes. The problem is that with this limitation we might not be able to target the exact structures we need.