title: Validating a Website
body: <p>I have been assigned the task of validating a website. 
  I searched the web and found <a href="http://www.w3schools.com/web/web_validate.asp" rel="nofollow">this</a> post of w3schools that 
  allows validating the HTML, CSS, XHTML, XML, WML of a website.</p>
  
  <p>My question is, is that all the validation we need to do? 
  We want our website to be cross-browser and to work well on mobile phones.</p>
  
  <p>Are there any better methods to validate our site?</p>
  
  <p>Thank You.</p>