W3C is an online service for validating the website or blogs for HTML and CSS. A valid HTML page will appear properly on any browser and will load really fast too. The W3C online validating program will let you rectify the problems in your HTML page by showing the bug and the source.
Once you resolve all the problems and warnings codes, you will get “Valid” icons for your page which will let the users know that this is a valid HTML page. The HTML and CSS icons are as below:
So if you want the page load time to reduce and the webpage to optimize then always validate your website or blog with the W3C service. The another advantage of using a validation tool is that the certificate of the valid site will build a confidence in your viewer’s mind and they can browse your site without any load problem.
HTML and CSS are the core of your website, and you can get the certificates for both of them from W3C service. You can see the source code and the issue simultaneously by checking the option “Show Source” on W3C page.