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    <meta charset="UTF-8"/>
      /* 1つのタイルの見た目を調整 */
      .tile {
        width: 70px;
        height: 70px;
        border: 3px solid cornflowerblue;
        border-radius: 10px;
        text-align: center;
        font-size: 36px;
        font-family: sans-serif;
        background-color: white;
        box-shadow: rgb(128, 128, 128) 5px 5px;
        "use script";
        function init() {     
            // ここにJavaScriptコードを書く
            let tableEl = document.getElementById("table")
            let trEl = document.createElement("tr")
            let tdEl = document.createElement("td")
            tdEl.className = "tile" // <td class="tile">と同じ!
            trEl.onclick = myClick // <td onclick="myClick(event)">と同じ!(event)は自動的に渡されている
            tdEl.textContent = "1" // <td>1</td>と同じ!
            trEl.appendChild(tdEl) // <tr><td></td></tr>と同じ!
            tableEl.appendChild(trEl) // <table><tr><td></td></tr></table>と同じ! 
        function myClick(event) {

  <body onload="init()">
    <table id="table"></table>