Test case -
<!doctype html>
<script src="http://code.jquery.com/jquery-git2.js"></script>
<style>
div, p { display: none }
</style>
<div>stuff<br/>that<br/>takes<br/>a<br/>height</div>
<p>stuff<br/>that<br/>takes<br/>a<br/>height</p>
<script>
$("p").show();
$("div").slideDown();
</script>
Changing jquery-git2 to jquery-2.1.1 fixes the issue. This is a regression.
This is caused by 86419b1