Mike Walsh

phpHtmllib is a set of PHP classes and library functions to help facilitate building, debugging, 
and rendering of XML, HTML, XHTML, WAP/WML Documents, and SVG (Scalable Vector Graphics) images 
as well as complex html ‘widgets’. It provides a mechanism to output perfectly indented/readable 
tags, and a programmatic API to generating tags on the fly.
More information can be found on the <a href="http://michaelwalsh.org/wordpress/wordpress-plugins/phphtmllib/" rel="nofollow ugc">phpHtmlLib</a> 
plugin page.

phpHtmlLib

The phpHtmlLib library contains a set of PHP classes and library functions to help facilitate…

Weston Ruter

This plugin is developed at <a href="http://www.shepherd-interactive.com/" title="Shepherd Interactive specializes in web design and development in Portland, Oregon" rel="nofollow ugc">Shepherd Interactive</a> 
for the benefit of the community. No support is available. Please post any questions to the <a href="https://wordpress.org/tags/xhtml5-support?forum_id=10" rel="ugc">support forum</a>.
Allows templates to serve XHTML5 markup by adding the necessary JavaScript shim for IE7+, and for IE6 by converting all new elements to <code>div</code>s and <code>span</code>s with class names that contain the original HTML5 element name prefixed by “<code>html5-</code>“, for example: <code><article></code> becomes <code><div class="html5-article"></code> 
and <code><time></code> becomes <code></code>
If the browser supports XHTML, the content is served with the <code>application/xhtml+xml</code> 
MIME type. This can be disabled by placing <code>remove_filter('option_html_type', 'xhtml5support_filter_html_type')</code> 
in <code>functions.php</code>.
Note that print stylesheets do not get applied to IE7+ even with the shim, so if you are relying on the ability for IE users to print properly-styled pages, you must force the IE6 renaming behavior for all versions of IE by doing <code>update_option('xhtml_support_add_msie_shims', false);</code>

XHTML5 Support

Allows templates to serve XHTML5 markup by adding the necessary JavaScript shim for IE7+ and by converting all new elements to divs and spans with app …

phpHtmlLib vs XHTML5 Support