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HTML

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Insecure Resource

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CSS

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CSS Base

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Vendor Prefixing

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JavaScript

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JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

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Babel includes JSX processing.

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HTML 

              
                <body>
  <table id="tbl">
      <tr>
        <th>比較</th><th>テックアカデミー</th><th>テックキャンプ</th>
      </tr>
      <tr>
        <th>学習方式</th><td>オンライン</td><td>教室</td>
      </tr>
      <tr>
        <th>言語</th><td>いろいろ</td><td>Ruby on Rails</td>
      </tr>
      <tr>
        <th>料金</th><td>20万円</td><td>10万円</td>
      </tr>
    </tbody>
  </table>
</body>
!

CSS 

              
                    table {
      background-color: #ffe;
      border-collapse: collapse;
    }
    table th {
      background-color: #eee;
    }
    table th, table td {
      border: solid 1px #aaa;
      padding:15px;
    }
!

JS 

              
                var mytable = document.getElementById("tbl");

//1つ目のやり方
var mytr = mytable.insertRow(1); //引数-1 : 表の一番最後に1行追加

//thセルの追加
var myth = document.createElement("th");
myth.innerHTML = "URL";
mytr.appendChild(myth);

//tdセルの追加
var mycell1 = mytr.insertCell(1);
var mycell2 = mytr.insertCell(2);

//textContentでもいいしinnnerHTMLでもいいし
mycell1.textContent = "techacademy.jp";
mycell2.innerHTML = "<span style=color:#aaf;>tech-camp.in</span>";

//2つ目のやり方
var mytr2 = mytable.insertRow(-1); //引数-1 : 表の一番最後に1行追加

var myth2 = document.createElement("th");
var myth2Txt = document.createTextNode("評価");
myth2.appendChild(myth2Txt);
mytr2.appendChild(myth2);

mycell3 = mytr2.insertCell(1);
mycell3Txt = document.createTextNode("●●●●");
mycell3.appendChild(mycell3Txt);

mycell4 = mytr2.insertCell(2);
mycell4Txt = document.createTextNode("★★★★");
mycell4.appendChild(mycell4Txt);
!
999px

Console