Set DOCTYPE for a self rendered HTML page using cl_gui_html_viewer

G'Day!
I'm dealing with HTML in ABAP and i' stuck with a nasty little problem. Perhaps somebody know's the answer and can help me out. Thanks in advance. (I'm sorry for my poor english)
My problem is:
I am rendering a html page in abap and display ist using a cl_gui_html_viewer.
Works fine.
But now in need to set the right DOCTYPE for the rendered html page.
If i add the DOCTYPE definition, my html page is not displayed, instead i get a display of the html-code??
To break it down to the root:
How can i add the DOCTYPE definition to a self-rendered html page?
If i add the DOCTYPE definition as first element of my html table, the html code won't be interpreted.
If i do not add the DOCTYPE defintion everything works fine.
I need the DOCTYPE definition so that the browser won't get into quirks mode and interpretes the html tag's right.
What i've done so far:
(Dynpro, container, html_viewer)
Load my JScripts (with load_mime_object)
Load my CSS (with load_mime_object)
Load my HTML:
-- lt_html TYPE w3htmltab
((-- APPEND '<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN">' TO ct_html.)) this line cause my trouble
-- filled the itab with my html tags <html>....</html> (set right url for Jscript and CSS)
-- Load my html table and get an URL CALL METHOD gr_labform_html->load_data
-- Load the url CALL METHOD gr_labform_html->show_url

I've "solved" my issue with a little workaround.
I created an empty html page with an existing DOCTYPE def and an tag like <!MYDATA!>
After that i filled 'l_merge_table TYPE swww_t_merge_table' with my tag and my html_data.
Loaded the whole thing with CALL METHOD gr_labform_html->load_html_document and now the DOCTYPE is set fully correct!
But i'm still interessted why i can't set the DOCTYPE directly? Anybody knows?
Got the idea from: Re: How can I read color from frond-end PC

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Set DOCTYPE for a self rendered HTML page using cl_gui_html_viewer

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