A paragraph containing a span containing the uppercase alphabet in which A though M should be in SourceSansPro Bold and N through Z should be in a serif font. ABCDEFGHIJKLMNOPQRSTUVWXYZ.

A paragraph containing a span containing the lowercase alphabet in which A though M should be in a serif font and N through Z should be in SourceSansPro Bold. abcdefghijklmnopqrstuvwxyz.