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JavaScript

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HTML 

              
                <table>
  <caption>
    従業員リスト
  </caption>
  <tr>
    <th>名前</th>
    <th>職種</th>
    <th>年齢</th>
  </tr>
  <tr>
    <td>山田 太郎</td>
    <td>エンジニア</td>
    <td>30</td>
  </tr>
  <tr>
    <td>鈴木 一郎</td>
    <td>マネージャー</td>
    <td>45</td>
  </tr>
  <tr>
    <td>佐藤 恵子</td>
    <td>デザイナー</td>
    <td>28</td>
  </tr>
</table>
!

CSS 

              
                :root {
  --edge:16px;
}
table {
  border-spacing: 0;
  //collapseの場合、角が丸くならない
  // border-collapse: collapse;
  border-radius: var(--edge);
  border: 1px solid black;
  //captionまでかかるからだめ
  // outline: 1px solid black;
}

th:not(:last-child),td:not(:last-child) {
  //thの最後以外のth（名前と職種のみ適用）とtdの最後以外のtd（年齢の列以外のtd）
    border-right: 1px solid black;
}
th, tr:not(:last-child) td{
  //th全部（名前・職種・年齢）とtrの最後のtd以外のtd（佐藤 恵子の行以外のtd）
    border-bottom: 1px solid black;
}

caption {
  padding: 10px;
  font-size: 1.25rem;
}

tr > * {
  padding: .75em; 
  text-align: center;
}
tr:has( >th){
  clip-path: inset(0 round var(--edge) var(--edge) 0 0);
  background-color: #aff9ff;
}
!

JS
!
999px

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