Code Quality When Designing Websites
Web pages which have a good support, often have a good practice to conform to standards and this is usually done via a description specifying what the element is doing. However, it is not true to say that a website will be unusable or error prone if it is failure to conform to standards. But standards can relate to the layout of pages for readability, highly appreciated by search engines or making sure coded elements are closed appropriately. The conformation of standards includes no errors in code, more organized layout for code, and making sure IDs, attributes and classes are identified properly. Poorly-coded pages are sometimes colloquially called tag soup.
In each web page, the use of W3C validator can only be done when it has a correct DOCTYPE declaration, which is used to highlight errors in code. The system identifies the errors and areas that do not conform to website design standards, and this information can help website designers to correct and make the web page more conformable with the standards.