What should a design style guide include?
A style guide is a document that contains design guidelines for each repeatedly used design element, such as visual identity elements, icons, interface components, and their states, headings, etc.
What is style guide software development?
A style guide tells a developer how to work with a particular programming language. Programming style guides are composed of rules and guidance. Rules are mandates, with very few exceptions, enforceable throughout the entire IT organization. Rules make good and bad programming behavior explicit.