Hello Andreas,
I've found the following works quite well, when placed in the document's <head>.
<style>
html { overflow: auto; }
body { overflow: auto; }
/* Other styles to follow */
</style>
There are other solutions out there, like making the document's first line <body style="overflow: auto">, however those solutions break the markup.
In addition, you other thread regarding the <!doctype html> declaration:
http://scn.sap.com/thread/1454752
Would you mind reopening this thread so we might discuss? I've encountered the same problem, but the merge solution you provided doesn't work correctly for me. I have a mime repo object, which contains the lines:
<!doctype html>
<!CONTENT!>
and I perform a merge on the <!CONTENT!> tag, replacing it with my entire HTML document, but only the first line of my HTML is inserted (when the command is 'r' - replace). Is this what you found?