<!DOCTYPE html> <html> <head> <title>boka-n</title> <script type="text/javascript" src="countdown.js" charset="utf-8"></script> <style type ="text/css"> div {border: 1px solid black; margin: auto: width: 10wm; text-align:center;} </style> </head> <body> <div id = "atari1"><p>1</p></div> <div id = "atari2"><p>2</p></div> <div id = "atari3"><p>3</p></div> <div id = "atari4"><p>4</p></div> <div id = "atari5"><p>5</p></div> <div id = "atari6"><p>6</p></div> <div id = "atari7"><p>7</p></div> <div id = "atari8"><p>8</p></div> <div id = "atari9"><p>9</p></div> <div id = "atari10"><p>10</p></div> <p><button id="start"type="button" value="START">開始</button></p> <h3><p id="info">開始を押してスタート</p></h3> </body> </html>