The default virtual browser height in pixels is set to autodetect the HTML content height.

C# | Visual Basic | Visual C++ |
public const int AUTO_HTML_VIEWER_HEIGHT_PX
Public Const AUTO_HTML_VIEWER_HEIGHT_PX As Integer
public: literal int AUTO_HTML_VIEWER_HEIGHT_PX

Assembly: ExpertPdf.HtmlToPdf (Module: ExpertPdf.HtmlToPdf.dll) Version: 9.2.0.25824 (9.2.0.0)