css隐藏多余的文字并出现省略号

<meta charset="utf-8" />
<style>
.txt{
    width:200px;
    border:1px solid #ddd;
    overflow: hidden;
    white-space: nowrap;
    text-overflow: ellipsis;
}
</style>
<p class="txt">溢出溢出溢出溢出溢出溢出溢出溢出溢出溢出溢出溢出溢出溢出溢出溢出溢出溢出</p>