I discovered a minor problem when entering some inline css.
start with just this line...
<p style="font-size: 12px; width: 120px">test</p>
now if you put the curser before font-size and type font-family: and select from the autocomplete menu it wipes out the existing font-size text and you end up with...
<p style="font-family: Arial, Helvetica, sans-serif: 12px; width: 120px">test</p>