<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>HTML框架</title>
</head>
<frameset cols="20%,50%,30%"> <!--frameset不在body内添加-->
<frame src="framea.html"></frame>
<frame src="frameb.html"></frame> <!--framea,frameb,framec--三个框架>
<frame src="framec.html"></frame>
</frameset>
</html>
<!--framea-->
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>HTML框架</title>
</head>
<body bgcolor="green">
</body>
</html>
<!--frameb-->
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>HTML框架</title>
</head>
<body bgcolor="red">
</body>
</html>
<!--framec-->
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>HTML框架</title>
</head>
<body bgcolor="yellow"
</body>
</html>