Html to PDF with 3 mm bleedbox on every side - abcpdf

Question

We need to generate PDF from HTML with ABCPDF, letting 3 mm bleedbox on every side of the document. So that after printing there is enough room for cutting the edges of the page and bind a book from the printed pages.

I have tried below code with some variations.

I am not able to get exact documentation (I doubt it exists). The nearest documentation is here.

I wonder if someone has done this or can guide in the right direction.

Here's the code snippet to start with.

using WebSupergoo.ABCpdf8;

namespace BleedBoxDemo
{
    class Program
    {
        static void Main(string[] args)
        { 
            string filePath = @"c:\myhtmldocument.html";

            if (System.IO.File.Exists(filePath))
            {
                string content = System.IO.File.ReadAllText(filePath);

                Doc theDoc = new Doc();

                theDoc.MediaBox.String = "A4";
                theDoc.Page = theDoc.AddPage();

                theDoc.SetInfo(theDoc.Page, "/BleedBox:Rect", "20 20 180 280");

                //for (int i = 1; i <= 2; i++)
                //{
                //    theDoc.FrameRect();
                //    theDoc.Rect.Inset(20, 20);
                //}

                //theDoc.Save(@"C:\mypdfdocument.PDF");
                //theDoc.Clear();

                theDoc.AddHtml(content);
                theDoc.Rect.String = "0 0 612 792";
                theDoc.FrameRect();
                theDoc.Rect.Inset(20, 20);
                theDoc.Save(@"C:\mydocumentwithbleedbox.PDF");
                theDoc.Clear();
            }
        }
    }
}