<!DOCTYPE html>
<html lang="ja">
<head>
<title>random_button</title>
<script type="text/javascript" src="timer.js"></script>
<link rel="stylesheet" type="text/css" href="timer.css">
</head>
<body>
<h1>3秒以内に当たりを見つけてね</h1>
<button id = "start">start</button>
<p id="message"></p>
<div id="box">
<div><p>1</p></div>
<div><p>2</p></div>
<div><p>3</p></div>
<div><p>4</p></div>
<div><p>5</p></div>
<div><p>6</p></div>
<div><p>7</p></div>
<div><p>8</p></div>
<div><p>9</p></div>
<div><p>10</p></div>
</div>
</body>
</html>
C121119A