超出部分用省略号代替，鼠标放上去显示多余部分内容

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <style>
        #overplus { width:100px; overflow:hidden; white-space:nowrap; text-overflow:ellipsis;}
        #overplus:hover { width:auto;}
    </style>
</head>
<body>
<div id="overplus">我是一部分我是剩余部分</div>
</body>
</html>

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