Test your code

Here are some great website where you can test your code to make it more robust.

1) HTML

W3C Validator Click Here
This validator checks the markup validity of Web documents in HTML, XHTML, SMIL, MathML, etc. If you wish to validate specific content such as RSS/Atom feeds or CSS stylesheets, MobileOK content, or to find broken links, there are other validators and tools.

Note – If you have your CSS and Javascript Code within HTML this validator will also test your CSS and JavaScript code with HTML


2) CSS

W3C Validator Click Here


3) JavaScript and JSON

Javascriptlint Click Here

JSLing Click Here

CodeBeautify Click Here