When I use aspose-pdf-10.4.1.java to convert the attached pdf to html, the resulting html has background. The conversion code is simple.
//
// Generate html from the pdf
//
ByteArrayInputStream inStream = …...HtmlSaveOptions saveOptions = new com.aspose.pdf.HtmlSaveOptions();...HtmlSaveOptions(); saveOptions.FontSavingMode = HtmlSaveOptions...