Marquee validating w3c
The Markup Validation Service is a validator by the World Wide Web Consortium (W3C) that allows Internet users to check HTML and XHTML documents for well-formed markup.Markup validation is an important step towards ensuring the technical quality of web pages.In this chapter, you will learn about descendant combinator and its working.
Also, for the "img" element, width="really wide" is also accepted as valid.
Certain other XML documents can also be validated if they refer to an internal or external DTD.
Mark-up validators cannot see the "big picture" on a web page, but they excel at picking up missed closing tags and other technicalities.
No SQL can be defined as an approach to database designing, which holds a vast diversity of data such as key-value, multimedia, document, columnar, graph formats, external files, etc.
No SQL is purposefully developed for handling specific data models having flexible schemas to build modern applications.