One problem with sites that employ a banner that hovers above the page content, and stays fixed when the page scrolls, is that this does not interact well with Landmarks' scrolling the top of a landmark region into view—the top of the region can appear behind the banner.
Have thought of some potential heuristics for this, but it starts to feel a bit ropey and may have unforseen consequences on some sites. Might need some time and experimentation...
One problem with sites that employ a banner that hovers above the page content, and stays fixed when the page scrolls, is that this does not interact well with Landmarks' scrolling the top of a landmark region into view—the top of the region can appear behind the banner.
Have thought of some potential heuristics for this, but it starts to feel a bit ropey and may have unforseen consequences on some sites. Might need some time and experimentation...