First of all: thanks for the answer Andrew!
But I didn't mean the MS Word zoom factor. So I try to explain my problem in another way.
My goal is to let the user of my CHM help file decide which font size he want's to use. If you are working with a 20" display a 12 pt font size might be fine. But if you use a 7" display (e.g. eeePC), a smartphone or if you are visually handycapped the wish to increase the fonts grows. I've already used such CHM files which enabled the ctrl + mouse wheel function of the Internet Explorer in the HTML Help Control (Microsoft's CHM viewer).
When I create a help project based on word sources with DTH the compilation process generates a css file in drive:\projectdir\HTMLHelp\LinksExt\C1H_HTML.css. This file contains an entry e.g.
H1 {..... FONT-SIZE: 20pt; }
The unit pt creates a fixed font size in my chm file, so that you cannot use ctrl + mouse wheel IN MY CHM FILE. However, to correct that behavior I need a style e.g.
H1 {..... FONT-SIZE: 120%; }
As far as I understand the css file drive:\projectdir\HTMLHelp\LinksExt\C1H_HTML.css is created from the styles in my target Word template. But how can I define a percental font size in my target DOT. Is this possible at all or is there another workaround?
Sorry, English is not my native language. Thas might be the reason why you could misunderstand my first problem description. Building this few sentences together was so hard for me that I need a break now :)
Thanks again,
Cossman