해당 번호가 없습니다.
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title> 다이브 연습 </title>
<style type="text/css">
.box {position:absolute; width:100px; height:100px;
border:3px solid black;
}
#a{position:absolute; left:450px; background-color:#ffcc00}
#b{position:absolute; left:300px; top:100px; background-color:#fe39ee}
#c{position:absolute; left:500px; top:500px; background-color:#cd38f3}
#d{position:absolute; left:750px; top:300px; background-color:#00ccff}
</STYLE>
</head>
<body>
<div class="box" id="a" on1mouse1over="box.style.visibility="visible" on1mouse1out="visibility="hidden">apple</div>
<div class="box" id="b"on1mouse1over="visibility="visible" on1mouse1out="visibility="hidden">lemon</div>
<div class="box" id="c"on1mouse1over="visibility="visible" on1mouse1out="visibility="hidden">grape</div>
<div class="box" id="d"on1mouse1over="visibility="visible" on1mouse1out="visibility="hidden">melon</div>
</body>
</html>