When opening a HTML document in Excel, Excel renders the <hr> tag as a line that spans the width of the row (up to the last used column). When using GemBox to convert the HTML to Excel, the <hr> tag is ignored and nothing displays. It would be very useful to have this line preserved after converting to Excel.
Mario at GemBox
This feature request has been implemented and is available in the latest versions of GemBox.Spreadsheet.