<p>The <code>[tag:tagname]</code> syntax is <a href="http://meta.stackexchange.com/questions/66965/is-there-some-markup-to-post-tags/69482#69482">now supported</a> in the post, but the preview doesn't recognize them and show them as plain text (i.e. instead of <a href="/questions/tagged/markdown" class="post-tag" title="show questions tagged 'markdown'" rel="tag">markdown</a>, it is simply displayed as [tag:markdown] ).</p>