We can edit the text inside a tag by cit (change inside tag)
<li> He | llo </li>
enter cit and now we have
<li> | </li>
Similarly, we can yank and delete inside the tag ( yit and dit )
Note: | is the cursor.
also, cat/yat/day works on the entire tag and its content (i.e. as a whole element) starting from the < of the opening tag to the > of the closing tag.
my favorite is guit/gUit to downcase or upcase everything in a tag