A manual that includes specific instructions for the proper use and placement of type and graphics. Editorial style guides outline instructions for standardizing punctuation and proper usage according to an agreed-upon style for a set of publications.
a publication which specifies details of writing style required by a particular publishing house or professional organization, including such matters as punctuation, capitalization, and rules for citing references. For example, the ACS Style Guide : a Manual for Authors and Editors.
A comprehensive description of standards that an organization expects designers to conform to. The style guide usually discusses how an interface will look and what the underlying coding structure should look like as well. Designers may still be given a lot of flexibility as to how they achieve their design.