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A Microsoft Excel file may contain many unused styles. When you export the Excel file to HTML format, these unused styles are also exported. This can increase the size of HTML. You can exclude the unused styles during the conversion of an Excel file to HTML using the HtmlSaveOptions.exclude_unused_styles property. When you set it to true, all unused styles are excluded from the output HTML. The following screenshot displays a sample unused style inside the output HTML.

The following sample code creates a workbook and also creates an unused named style. Since the HtmlSaveOptions.exclude_unused_styles is set to true, this unused named style will not be exported to the output HTML. But if you set it to false, then this unused style will be present in the output HTML, which you can then see in the HTML markup as shown in the above screenshot.
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