1 <div id=
"target" style=
"width: 200px; height: 100px; background-color: red;">
2 <div style=
"width: 100px; background-color: green;">
3 <span style=
"float: left; width: 10px; height: 100px;"> </span>
4 <br style=
"clear: both;">
8 document
.body
.offsetTop
;
9 document
.getElementById("target").style
.width
= "100px";