文字纵向滚动marquee

<div style="width:200px; height:300px">
<marquee direction="up" truespeed="truespeed" height="300px" behavior="scroll">
<p>hellohellohellohellohellohellohellohellohellohello</p>
<p>hellohellohellohellohellohellohellohellohellohello</p>
<p>hellohellohellohellohellohellohellohellohellohello</p>
</marquee>
</div>