Find rule sets that match a given element.
std::vector<CL_CSSProty> CL_Document:nt::t::select( const CL_StringRef & element);
Detailed description:
The syntax of element is the same as specifying contextual elements in a CSS selector, i.e. 'body div.class a::id:link'.
The returned list is sorted with the most preferred properties returned first in the list.