Layout: widget positioning with coordinates

Hi, I would like to position widgets on a specific x, y, coordinates in a page, like top and left css tags. Is it possible to do so via editing css tags or in any other way? The document should run in server mode.

It is possible. The LayoutDOM model (e.g. Div is one of its subclasses) has the css_classes property that accepts a list of strings.
Note that it may result in an unexpected layout - Bokeh wraps each element in a div so it can make its own layout mechanism work.