Subject: sgml / html mode vs. <strong>, <em>

From: 積丹尼 Dan Jacobson <[email-masked]>
Date: Wed, 26 Sep 2018 14:47:42 +0800

sgml-mode.el says

   <p>Paragraphs only need an opening tag.  Line breaks and multiple spaces are
   ignored unless the text is <pre>preformatted.</pre>  Text can be marked as
   <b>bold</b>, <i>italic</i> or <u>underlined</u> using the normal M-o or
   Edit/Text Properties/Face commands.

OK but what about newer <strong>, <em> ?