I am trying to add markup such as <acronym> and <dfn> via the HTML Source Editor. These are valid, standard HTML phrase elements which are very helpful in making your content more meaningful.
Same story with <span> attributes such as "lang": for example, markup such as
after saving with "Insert"and reopening the text.
In an identical editing sequence things work perfectly with more common tags - <div>s, <p>s etc., which are saved.
Any idea what's happening here ? Is there any good reason why some tags are not allowed by SilverStripe's HTML Source Editor ?