html中float的运用

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>float</title>
    <style>
        div {
            width: 200px;
            height: 200px;
            background-color: red;
        }

        #float_left {
            float: left;
        }

        #float_right {
            float: right;
            height: 250px;
        }

        .general {
            /* clear: left; */
            /* clear: right; */
            clear: both;
            background-color: grey;
            width: 100%;
            height: 300px;
        }
    </style>
</head>
<body>
    <div id="float_left">float left,不占位，可以通过clear:left清除</div>
    <div id="float_right">float left,不占位，可以通过clear:right清除</div>
    <div class="general"></div>
</body>
</html>

演示地址
http://xhope.top/samples/html/float.html