it.javascript.info/2-ui/1-document/03-dom-navigation/4-select-diagonal-cells/source.view/index.html at 042060bfc776a648803aed286c0c9c947edc2cc4 · pasor1/it.javascript.info · GitHub

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<!DOCTYPE HTML>
<html>
<head>
  <style>
    table {
      border-collapse: collapse;
    }

    td {
      border: 1px solid black;
      padding: 3px 5px;
    }
  </style>
</head>

<body>
  <table>
    <tr>
      <td>1:1</td>
      <td>2:1</td>
      <td>3:1</td>
      <td>4:1</td>
      <td>5:1</td>
    </tr>
    <tr>
      <td>1:2</td>
      <td>2:2</td>
      <td>3:2</td>
      <td>4:2</td>
      <td>5:2</td>
    </tr>
    <tr>
      <td>1:3</td>
      <td>2:3</td>
      <td>3:3</td>
      <td>4:3</td>
      <td>5:3</td>
    </tr>
    <tr>
      <td>1:4</td>
      <td>2:4</td>
      <td>3:4</td>
      <td>4:4</td>
      <td>5:4</td>
    </tr>
    <tr>
      <td>1:5</td>
      <td>2:5</td>
      <td>3:5</td>
      <td>4:5</td>
      <td>5:5</td>
    </tr>
  </table>
  <script>
    let table = document.body.firstElementChild;

    // il tuo codice
  </script>
</body>
</html>