When creating a html document: start with this.

<html lang="en">
<head>
 <meta charset="utf-8">
 <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">

 <title></title>
 <meta name="description" content="">
 <meta name="author" content="">

 <meta name="viewport" content="width=device-width,initial-scale=1">

 <link rel="stylesheet" href="css/style.css">

</head>
<body>

<div id="container">
 <header>

 </header>
 <div id="main" role="main">

 </div>
 <footer>

 </footer>
</div> <!--! end of #container -->

<!--[if lt IE 7 ]>
 <script src="//ajax.googleapis.com/ajax/libs/chrome-frame/1.0.2/CFInstall.min.js"></script>
 <script>window.attachEvent("onload",function(){CFInstall.check({mode:"overlay"})})</script>
<![endif]-->

</body>
</html>

Based off of the HTML5 Boilerplate.