4 document
.body
.offsetTop
; // trigger layout
5 document
.getElementById('elm').style
.height
= '0';
8 <p>There should be a blue
<em>square
</em> below, with no red.
</p>
9 <div style=
"-webkit-columns:3; columns:3; -webkit-column-gap:0; column-gap:0; width:9em; line-height:9em; background:blue;">
12 <div id=
"elm" style=
"height:10em; background:red;"></div>