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This page tests background-size. What is the size of the background image? You can specify it in pixels, percentages, or scale it to fit the box.
The background image is sized normally.
auto
The background image’s size is determined by this property (100px 50px in the example).
100px 50px
The background images’s size is determined by this property (20% 50% in the example).
Effectively, this allows you to state how many times the background image is shown, though resizing will occur.
20% 50%
The image is scaled to the largest size that allows it to fit in the box, while retaining proper aspect ratio.
contain
The image is scaled to the largest size that allows it to cover the box completely, while retaining proper aspect ratio.
cover