The validity of the HTML code is a very important aspect of web site promotion, but many webmasters overlooked it.
What is valid HTML code?
Most of the web pages are written in HTML. Every document witten in HTML is supposed to follow these rules because HTML has its own grammar, vocabulary and syntax like very language.
HTML code that is not following the official rules is called invalid HTML code. HTML is constantly changing like any language. As HTML has become a relative complex language, it’s very easy to make mistakes.
Why the valid HTML code is important?
Search engines will find the relevant content of your web site via parsing the HTML code. Search engines might not be able to find everything on ther page if your HTML code contains errors.
Search engine crawler programs obey the HTML standard. It must be copliant to the HTML standard so that they can index your web site. They might stop crawling your web site and lose what they've collected so far because of the error in your web page code.
Althoght most major search engines can deal with minor errors in HTML code, your web page might cannot be found in search engines only with a single missing bracket in your HTML code.
If you miss some imortant tags, of close some tags improperly, search engines might ingnoe the complete content of that page.
How to check the calidity of your HTML code?
Luckily, you can have free services to check the validity of your HTML code. The W3 HTML Validator is the most common HTML validator.
It is a service to check HTML documents to find if they are conformance to W3C HTML and XHTML recommendations and other HTML standards.
The validator will tell your what errors are on the page when you enter the address of a web page on this page.
Although not all HTML errors will cause problems for your search engine rankings, some of them can keep web spiders from indexing your web pages.
Valid HTML code makes it easier for search engine spiders to index your site so you should make sure that at least the biggest mistakes in your HTML code are corrected.