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Microsoft Excel supports some types of dashed borders that are not supported by web browsers. When you convert such an Excel file into HTML using Aspose.Cells for Python via .NET, those borders are removed. However, Aspose.Cells for Python via .NET can also display such borders with the HtmlSaveOptions.export_similar_border_style property. Please set its value to true, and the unsupported borders will also be exported to an HTML file.
The following sample code loads the sample Excel file that contains some unsupported borders, as shown in the screenshot below. The screenshot further illustrates the effect of the HtmlSaveOptions.export_similar_border_style property in the output HTML.

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