I jumped here looking for the very same thing, but none worked for me.
There are instances where regardless what you do, and depending on the system (Oracle Designer: Oracle 11g - PL/SQL), divs will always go to the next line, in which case you should use the span tag instead.
This worked wonders for me.
<span float: left; white-space: nowrap; overflow: hidden; onmouseover="rollOverImageSectionFiveThreeOne(this)">
<input type="radio" id="radio4" name="p_verify_type" value="SomeValue" />
</span>
Just Your Text ||
<span id="headerFiveThreeOneHelpText" float: left; white-space: nowrap; overflow: hidden;></span>