tompahoward

The Tiny XHTML plugin re-adds the xhtmlxtras plugin support to the TinyMCE Rich Visual Editor. 
The TinyMCE table plugin is normally bundled with TinyMCE, but it has be removed from the 
version within WordPress. This plugin puts it back in.
The xhtmlxtras TinyMCE plugin allows you to control common attributes, such as class, id, lang, onclick, etc. 
It also provides buttons for creating cite, ins, del, abbr, and acronym elements.
Most of the credit for this plugin belogns to [Moxiecode Systems] (http://tinymce.moxiecode.com/ ), 
who wrote the Table plugin for TinyMCE, which this plugin uses.
<h3>Release Notes</h3>
<ul>
<li>0.0.2
<ul>
<li>Added workaround for TinyMCE compressor issues.</li>
</ul>
</li>
<li>0.0.1
<ul>
<li>Fixed defect in link to xhtmlxtras stylesheet</li>
</ul>
</li>
<li>0.0.0
<ul>
<li>Initial Release</li>
</ul>
</li>
</ul>

Tiny XHTML

The Tiny XHTML plugin re-adds the xhtmlxtras plugin to the TinyMCE Rich Visual Editor

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 …

Tiny XHTML vs XHTML5 Support