The benefits and importance of valid code may seem insignificant to websites that are in the top rankings, but think of how much better these websites would be indexed with perfect (X)HTML valid code.

Having valid code with no errors prevents browsers from auto-correcting your code, so you don’t end up with a broken layout. Pages will load faster when a website has valid code because the browser doesn’t have to think as much. Valid code ensures your website will display properly today and on future devices as well. Also, Google and other search engines tend to put websites with valid code higher in the rankings, above those that do not. Finally, websites with valid code are considered accessible to most types of platforms, browsers and screen readers.

There is no replacement for having perfect (X)HTML code in your website. When you run a check for validation and get that green bar, you know it’s a job well done. Also, having valid code in (X)HTML on your website can give you that edge needed to place higher in the rankings of search engines. Giving my customers websites with perfect code is a practice I base my reputation upon.

Validate HTML and CSS with these websites:
CSS Validator
HTML Validator
W3 HTML Validator

For more on this subject read my article
“The Benefits of Perfect XHTML Code”