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Showing content from https://developer.mozilla.org/en-US/docs/Web/API/HTMLTableRowElement/rowIndex below:

HTMLTableRowElement: rowIndex property - Web APIs

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The rowIndex read-only property of the HTMLTableRowElement interface represents the position of a row within the whole <table>.

Even when the <thead>, <tbody>, and <tfoot> elements are out of order in the HTML, browsers render the table in the right order. Therefore the rows count from <thead> to <tbody>, from <tbody> to <tfoot>.

The index of the row, or -1 if the row is not part of a table.

This example uses JavaScript to label all the row numbers in a table.

<table>
  <thead>
    <tr>
      <th>Item</th>
      <th>Price</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td>Bananas</td>
      <td>$2</td>
    </tr>
    <tr>
      <td>Oranges</td>
      <td>$8</td>
    </tr>
    <tr>
      <td>Top Sirloin</td>
      <td>$20</td>
    </tr>
  </tbody>
  <tfoot>
    <tr>
      <td>Total</td>
      <td>$30</td>
    </tr>
  </tfoot>
</table>

const rows = document.querySelectorAll("tr");

rows.forEach((row) => {
  const z = document.createElement("td");
  z.textContent = `(row #${row.rowIndex})`;
  row.appendChild(z);
});

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