A simple example:
l======l
& b
l
ww
ww
l
wwwww
<![CDATA[
<u id=msm><s id=ie6> <! set font and fix IE6 bug >
<s style=top:0> <! anchor first line >
<s id=stv>l=====<a id=b3></a>=l</s> <! bar-stave-bar >
<s id=e3>& <u id=n0>b</u></s> <! G-clef and flat >
<s style=left:2em>l <! 1st measure-bar >
<s id=e3>
<s id=n1>w</s><s id=n3>w</s> <! stack of >
<s id=s1>w</s><u id=s3>w</u> <! four notes >
</s>
</s>
<s style=left:3em>l <! 2nd measure-bar >
<s id=e3>
<u id=n4>w</u><u id=n2>w</u><u id=s0
>w</u><u id=s2>w</u><u id=s4>w</u> <! run of five >
</s>
</s>
</s> <! end anchor >
</s> <! end IE6 fix >
<br><br> <! two 1em LFs >
</u>
]]>