HTML. First developed by Tim Berners-Lee in 1990, HTML is short for HyperText Markup Language. HTML is used to create electronic documents (called pages) that are displayed on the World Wide Web. Each page contains a series of connections to other pages called hyperlinks.
Formal methods. In computer science, specifically software engineering and hardware engineering, formal methods are a particular kind of mathematically based techniques for the specification, development and verification of software and hardware systems.
The software engineer creates formal specifications for this model. These methods minimize specification errors and this result in fewer errors when the user begins using the system. Formal methods comprise formal specification using mathematics to specify the desired properties of the system.