Formatting word pages using MSO style prefixes

I need to pre-format an MS page. Particularly fonts so that they are consistent with a website. MS seems to ignore at the very least the font-family MSO styles set.

I have already tried !important and saving the word document as a web page, editing styles and using those in the original HTML file I'm trying to format on the word page.

My code:

<style>
h1 {
    font-family:'Trebuchet MS', Arial, sans-serif!important;
    mso-fareast-font-family:"Trebuchet MS"!important;
    }

p { 
    font-family:"Arial",Helvetica,sans-serif!important;
    mso-fareast-font-family:"Arial"!important;
  }
</style>

<%
  Dim file
  file = "saveddocument.doc"

  With Response
        .Buffer = True
        .ContentType = "application/msword"
        .AddHeader "content-disposition", "inline; filename=" & file
        .Write "<h1>This text should be formatted as Trebuchet MS</h1>" _
             & "<p> This text should be formatted as Arial</p>"

        .Flush
        .End
  End With
%>

Expected Results:

When MS Word is opened the h1 headings should be styled with the font Trebuchet MS and the p tags with Arial.

Current result:

Defaulting to Times New Roman

What am I missing? Any help is much appreciated.

Solution

The answer to this for me goes as follows:

    Response.ContentType = "application/msword"
    Response.AddHeader "Content-Disposition", "attachment;filename=HelpFile.doc" 
    Response.write("<html " & _ 
        "xmlns:o='urn:schemas-microsoft-com:office:office' " & _
        "xmlns:w='urn:schemas-microsoft-com:office:word'" & _ 
        "xmlns='https://www.w3.org/TR/html401/'>")

The xmlns code in particular was missing from my code and thus was unable to read the css.

Adding this into the document ensured that it was readable and fixed my font formatting issues. I hope this answer can help others in a similar situation in the future.