Line spacing in Rich text field on web

It seems that line spacing works differently in R5 and R6 when the document is created in Notes client and viewed from Web.

If you specify line spacing in a Body field to “Above 1 1/2” the result differs depending on Domino version:

R5 generates
before the text

R6 generates no

The Domino help says in both cases:

A line spacing which is not a whole number will be rounded up to the nearest whole number. For example, a line spacing of 1.5 will be rounded up to 2.

Has anybody encountered the same problem? Is there a server setting that can change the behaviour?

/Eva