index.html

<html lang="pl">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <link rel="stylesheet" href="./style.css">
    <title>Kółko i Krzyżyk</title>
</head>

<body>
   <div hidden id="komunikat">
       <h1 id="tresc">Test</h1>
       <button id="przycisk">Zagraj jeszcze raz</button>
   </div>
    <table id="plansza">
        <tr>
            <th x="0" y="0"></th>
            <th x="1" y="0"></th>
            <th x="2" y="0"></th>
        </tr>
        <tr>
            <th x="0" y="1"></th>
            <th x="1" y="1"></th>
            <th x="2" y="1"></th>
        </tr>
        <tr>
            <th x="0" y="2"></th>
            <th x="1" y="2"></th>
            <th x="2" y="2"></th>
        </tr>
    </table>
    <script type="text/javascript" src="main.js"></script>
</body>
</html>