Hi Erwin, rounding off this interesting Thread.

What you can do is change the origin point of Main and Variant separately.
You place your Sticky objects touching and above the top of the page. They must be Sticky but Stick at Top also works.
You display Rulers and drag the top-left origin cross to the top of your menubar.
Perversely, Text or Text Inside boxes need to touch the top of the page from below; they then appear on and over the menubar.

Any clicked Heading Anchor now scrolls to the top of the page, which remains just under your menubars and visible at all times.

No CSS code, no cross-browser mismatch, just Xara developers getting it right (with the exception of text).

Acorn