Validating a web page or validating your HTML /XHTML or CSS code basically refers to using a program or an online service to check that the web page that you created is free of errors.
What does a HTML/ CSS validator do?
A html/css validator basically checks the page to make sure that the codes on your web page complies with the standards set by the World Wide Web Consortium (W3C). Some validators check only for errors in codes, while some others also make suggestions about your code, telling you when a certain way of writing code might lead to unexpected results.
Validating your webpage thus helps in Cross-Browser, Cross-Platform and Future Compatibility.
The W3C has its own online validator http://validator.w3.org/ which can be used for free. You can also validate your stylesheets from W3C using http://jigsaw.w3.org/css-validator.
WAVE is also a free web page validator. Note that only HTML code will be processed in WAVE. If your code contains PHP, ASP, or other scripting code, it will appear as plain text in the WAVE report.
Learn more about other free online validators.
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