I am using Java Aspose.PDF library (20.3) for converting the PDF to HTML. I found a case where some portion of the PDF is not appearing in HTML. Actually it is there in HTML but the visibility of HTML elements is coming as hidden. Please see the attached image and input PDF with the resultant HTML.
Issue: aspose-hidden-issue.png (1.1 MB)
PDF: aspose_issue_hidden.pdf (57.2 KB)
HTML: aspose_hidden_html.zip (45.6 KB)