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HTML

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CSS

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JavaScript

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HTML 

              
                <div id="wrap">
  
  <h1>Responsive <span>Table</span> Layout Sample</h1>
  <p class="description">レスポンシブデザインのテーブルレイアウト例</p>
    
  <div class="tableBlock pattern03">
  <table>
    <caption>レスポンシブテーブル パターン3：縦並び</caption>
    <tbody>
    <tr>
      <th>見出し1</th>
      <td>テキスト1-1</td>
      <td>テキスト1-2</td>
    </tr>
    <tr>
      <th>見出し2</th>
      <td>テキスト2-1</td>
      <td>テキスト2-2</td>
    </tr>
    <tr>
      <th>見出し3</th>
      <td>テキスト3-1</td>
      <td>テキスト3-2</td>
    </tr>
    </tbody>
  </table>
  <!-- /.tableBlock pattern03 --></div>
  
<!-- /#wrap --></div>
!

CSS 

              
                @import url(https://fonts.googleapis.com/css?family=Righteous);

#wrap {
  margin:2em auto;
  font-family: Arial, Roboto, “Droid Sans”, “游ゴシック”, YuGothic, “ヒラギノ角ゴ ProN W3”, “Hiragino Kaku Gothic ProN”, “メイリオ”, Meiryo, sans-serif;
  max-width:960px;
}
h1, h2 {
  text-align:center;
  font-family: 'Righteous', cursive;
}
h1 {
  font-size: 2.5em;
}
h1 span {
  color:#ffc045;
}
p.description {
  margin-top: 1em;
  letter-spacing:2px;
  text-align:center;
}
.btnList {
  margin-top: 2em;
  text-align:center;
}
.btnList li {
  display:inline-block;
}

/* 基本スタイル */
.tableBlock {
  margin-top:2em;
}
table {
  width:100%;
  table-layout:fixed;
  -webkit-box-sizing:border-box;
  box-sizing:border-box;
  border:1px solid #cfcfcf;
}
table caption {
  padding:1em;
  line-height: 1.5;
  text-align: left;
  background:#ffc045;
}
table tr th {
  background:#f2f2f2;
}
table tr th,
table tr td {
  padding:1em;
  line-height: 1.5;
  text-align:left;
  border:1px solid #cfcfcf;
}

/* Tablet */
@media screen and (max-width:768px){
  
  /* パターン3：テーブルセルを縦並びに */
  .tableBlock.pattern03 table,
  .tableBlock.pattern03 table caption,
  .tableBlock.pattern03 table thead,
  .tableBlock.pattern03 table tbody,
  .tableBlock.pattern03 table tr,
  .tableBlock.pattern03 table tr th,
  .tableBlock.pattern03 table tr td {
    display:block;
  }
  .tableBlock.pattern03 table tr th,
  .tableBlock.pattern03 table tr td {
    margin:-1px; /* borderが二重になるのを防ぐ */
  }
  
/* Tablet */ }
!

JS
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999px

Console