Avoiding common HTML5 mistakes

Between curating sites for the HTML5 gallery and answering readers’ questions here at HTML5 Doctor, I see a host of HTML5 sites and their underlying markup. In this post, I’ll show you some of the mistakes and poor markup practices I often see and explain how to avoid them.
Don’t use section as a wrapper for styling

One of the most common problems I see in people’s markup is the arbitrary replacement of <div>s with HTML5 sectioning elements — specifically, replacing wrapper <div>s (used for styling) with <section>s. In XHTML or HTML4, I would see something like this:

<!-- HTML 4-style code -->
<div id="wrapper">
  <div id="header"> 
    <h1>My super duper page</h1>
    <!-- Header content -->
  </div>
  <div id="main">
    <!-- Page content -->
  </div>12

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