Web 2.0 Is Not the Semantic Web
Web 2.0 is all about people. It’s a social thing. The second generation of the World Wide Web is focused on the ability for people to collaborate and share information online. Where the Web contains static HTML pages, Web 2.0 is dynamic, in that it serves applications to users and offers open communications with an emphasis on Web-based communities.

Five years ago when you said “I found out about that on the Web,”, everyone knew what you were talking about. By means of hyperlinking or using a Web search engine you found a Web site with information you wanted.

Today people may talk about the World Wide Web, Web 2.0 or the Semantic Web. There are a lot of misconceptions about their similarities and differences, and also where the technologies inherent to each overlap,

A selector  is a chain of one or more simple selectors separated by combinators. Combinators  are: white space, “>”, and “+”. White space may appear between a combinator and the simple selectors around it.  Let’s see below various selectors and how they work.

Web accessibility means that people with disabilities can use the Web

More specifically, Web accessibility means that people with disabilities can perceive, understand, navigate, and interact with the Web, and that they can contribute to the Web. Web accessibility also benefits others, including older people with changing abilities due to aging.