JavaScript-Courses/TableModify.html at master · AndreyKrotkikh/JavaScript-Courses · GitHub

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<!DOCTYPE HTML>
<html>

<head>
  <meta charset="utf-8">
  <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>
    var table = document.body.children[0];

    for (var i = 0; i < table.rows.length; i++) {
    	var row = table.rows[i];
    	console.log(row.cells[i]);
    	row.cells[i].style.backgroundColor = `red`;
    }
    /* ваш код */
  </script>
</body>

</html>