WordPress uses a combination of PHP, HTML and CSS to render the appearance of a blog. If the CSS contains invalid code, the blog will fail to display as intended, as the Web browser won't understand ...

I’ve been writing HTML since the late ‘90s, and while the web has evolved in a hundred different ways, the core of it really hasn’t. You still open a file, structure your markup, style it with CSS, ...

When it comes to creating your site, employing Web standards such as HTML 4, XHTML, and Cascading Style Sheets (CSS) gives you the best of all possible worlds. You ...

In the world of search engine optimization, a perennial argument is whether Google’s ranking factors look for clean code in a Web site. The W3C has developed two popular tools that check Web sites for ...