Dan,

RTL is meant for countries where they write from right-to-left (AFAIK mainly Arabic countries).

I would not expect anyone use this for alignment.

I quickly googled on rtl and web and I come to the conclusion that RTL in the web is done in a different way (<body dir="rtl">). My guess right now is that the HTML output from DataFlex Reports does not set the DIR attribute of the HTML element. I will log a suggestion for this.