DOCTYPE HTML html head title Квадрат title meta charset utf-8 link rel

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<!DOCTYPE HTML>
<html>
<head>
<title>Квадрат</title>
<meta charset="utf-8">
<link rel="stylesheet" href="Style.css">
<script type="text/javascript" src="script.js"></script>
</head>
<body>
<div id="d1" style="left:0"></div>
<input value="<=" type="button" onclick="l();" class="bt1"/>
<input value="=>" type="button" onclick="r();" class="bt2"/>
</body>
</html>