Controls how an image is positioned within its containing node
type: string, default:
imagepos only has an effect when the image is smaller than the containing node.
The default is to be centered both horizontally and vertically.
tl- Top Left
tc- Top Centered
tr- Top Right
ml- Middle Left
mc- Middle Centered (the default)
mr- Middle Right
bl- Bottom Left
bc- Bottom Centered
br- Bottom Right
Last modified June 12, 2022: add simple descriptions for attributes (b2a18ac)