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.
However, employing formal methods can help to achieve the desired safety level. Formal methods in software engineering are mathematical techniques that are used in the design, implementation and testing of computer systems. The application of mathematical methods in the development and verification of software is very labor intensive, and thus expensive.