How can I programmatically create, read, write an excel without having office installed?

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write your excel in HTML table format:

<html>
<body>
  <table>
    <tr>
    <td style="background-color:#acc3ff">Cell1</td>
    <td style="font-weight:bold">Cell2</td>
    </tr>
  </table>
</body>
</html>

and give your file an xls extension. Excel will convert it automatically

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