abstract：<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>CSS中的浮动作业</tit
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>CSS中的浮动作业</title>
<style type="text/css">
.fl {
float: left;
}
.fr {
float: right;
}
</style>
</head>
<body>
<div class="fl" style="background-color: blue;"></div>
<div class="fr" style="background-color: red;"></div>
</body>
</html>