If you want your website to be visited by as many users as possible then accessibility should be a big factor. Validation help for easy Coding and Maintenance Websites or web pages that validate using W3C website validation have code formatted efficiently and are easy to edit and it helps website owners to create a new page or another new website with similar formatting.
If your page isn’t displaying as expected a validator might very well point you to the cause of the display problems.
Also invalid code that may display fine in one document may cause show stopping errors in another because of the encompassing code.
When I wrote about validating CSS, some of the feedback was that if you validate/promote valid HTML, naturally you should validate your CSS.
With that sentiment, I’d argue that it’s as, if not more, important to also validate your Java Script code (if you don’t agree, skip to the question at the end of this post, and give me a reply to that).
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If you haven't used Grunt before, be sure to check out the Getting Started guide, as it explains how to create a Gruntfile as well as install and use Grunt plugins.You can read more about it in the JSLint documentation, but briefly put, it’s a great tool for verifying the syntax as well as best practices in your Java Script code.As Douglas himself usually puts it to people using it for the first time: While he might be right in some cases, I must say that since I started using it, my Java Script code has gotten a lot better and I’m able to avoid both plain syntax errors as well as runtime caveats that many of us stumble onto way too often.It also teaches and encourages best practices for web design.While many veterans have learned to create error-free code and make relatively few validation errors, most beginners make more errors.On the other hand, W3C validated websites are displayed without errors regardless of what browser is used.