Very often, people fall under the false impression that the World-Wide Web is home to graphical browsers only. The goal was to create a language that defines a document's structure in such a way that it could be presented on any platform, in any environment, in any way. That was the goal in mind when HTML was created and in large part, it has been successful. However, different browsers render webpages differently and it is important that a web-author ensure that the website presents itself well no matter the browser used, no matter the platform used. The soul of any website is its content.
Most websites boast content that is textual in nature.
To that end, certain checks must be applied to ensure that the site presents its content properly. The Elements of Style.