<p dir="auto">Applying navbar-fixed-top to the navbar class adds unwanted behavior when forms or drop downs are used in the navbar.</p>
<p dir="auto">This can be seen in the BS examples;</p>
<ol dir="auto">
<li>try clicking in a form field at <a href="http://getbootstrap.com/examples/jumbotron/" rel="nofollow">http://getbootstrap.com/examples/jumbotron/</a> and watch the "Project Name" text and green button text change to a finer/'less bold'/grayed out version.</li>
<li>try opening the drop down at <a href="http://getbootstrap.com/examples/theme/" rel="nofollow">http://getbootstrap.com/examples/theme/</a> and again watch the surrounding navbar text.</li>
</ol>
<p dir="auto">This is most noticeable on the inverse navbar but occurs on both.  The scrolling navbar is not affected (so this cannot be by design).</p>