<!DOCTYPE html>
<html>
    <head>
        <meta charset=utf-8>
        <style type="text/css">
            * {
                margin: 0;
                padding: 0;
            }
            section {
                width: 100px;
                height: 100px;
                background-color: black;
                left:10px;
            }
        </style>
    </head>
    <body>
    	<section></section>
    </body>
</html>

考察：

  1. 流定位的特性