Globe on the left, caret on the right. Before layers landed only the globe appeared; before the CSS3 shorthand fix, neither did.
Three globes 28px apart, each 44px wide, so they overlap: the leftmost is layer 0 and must be drawn over the two to its right.
Gradient layers stack but do not composite — each is
pre-blended against the box's background colour, not against the layer
underneath — so translucent gradient stacks still read wrong.
radial-gradient() remains one flattened wash whatever the layer
count.
Caret over globe, both centred: the single-valued
background-repeat and background-position apply to
both layers. A comma list on those longhands is not carried per
layer — only background and background-image
split into layers.