I would like to display a 2-line textual message in the *center* of the browser 
window. This would either be written across the map, or across the empty 
browser window (if I choose to make the map invisible) using a particular font 
and point/pixel size.

Is there a simply way to do this?

The only reference I can find to text is the "label" used on point features. I 
know that I can set a point in the exact center of the viewport and set the 
label text, but I can't see a way to have the text display with center 
justification which would be more aesthetically pleasing than starting at a 
particular X pixel position. It might be possible to set a pixel position if 
there was a way of measuring the horizontal pixel extent  of a line of text, 
but I can't see a way of doing that.

If point labels are the only way to display text, then does anyone have any 
ideas how this might be accomplished?

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