Note that the standard XHTML MES is configured for editing the contents of div's, table cells and list items. Editing using other elements as the "top" container (e.g. p, h1, inline elements) can be attempted, however some of the commands do not recognise the "top" boundary in these circumstances and will apply formatting outside the editable area.
Here is the basic XHTML markup for the boxes below:
<div> <p>Edit this <b>bold section</b> of text!</p> </div>
<div>
editable via inline styleEdit this bold section of text!
<p>
editable via inline styleEdit this bold section of text!
<b>
editable via inline styleEdit this bold section of text!