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The HTML5 microdata standard includes both HTML markup (primarily for search engines) and a set of DOM functions (primarily for browsers). There’s no harm in including microdata markup in your web pages. It’s nothing more than a few well-placed attributes, and search engines that don’t understand the microdata attributes will just ignore them. But if you need to access or manipulate microdata through the DOM, you’ll need to check whether the browser supports the microdata DOM API.

A general rule is that the section element is appropriate only if the element’s contents would be listed explicitly in the document’s outline.

How to transfer the default code to html5? Here it is: open the functions.php (you can find it in the theme folder), then copy and paste the following php code to the functions.php

To see an example of the <footer> within an article/section look no further than this very page.

<article>   Article content appears here.   <footer>   Footer information for article.   </footer></article>

There is a boolean attribute pubdate specifically for this

<time datetime="2010-01-20" pubdate>

A weblog-style <article> A published date leads us to add a <header>, and there’s also content that would be suitable in a <footer> elements. <article>  <header>    <h1>Apple</h1>    <p>Published: <time pubdate="pubdate">2009-10-09</time></p>  </header>  <p>The <b>apple</b> is the pomaceous fruit of the apple tree...</p>  ...  <footer>    <p><small>Creative Commons Attribution-ShareAlike License</small></p>  </footer></article>

Look up HTML5, CSS3, etc features, know if they are ready for use, and if so find out how you should use them – with polyfills, fallbacks or as they are.