The W3C logo is a syntax validator that helps web designers and developers ensure that their code complies with the current World Wide Web Consortium (W3C) standard.
Having valid code is very useful in avoiding compatibility issues with different versions of various browsers. It also allows users to show that their website is well-constructed and of professional quality.
Adding a W3C Logo Element
Drag-and-Drop the element W3C Logo from the elements menu anywhere on the page.
There is no configuration necessary. Validation occurs after the website has been published.