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background-position: refer to the size of the background positioning area minus size of background image; size refers to the width for horizontal offsets and to the height for vertical offsets
background-size: relative to the background positioning area
background-position: a list, each item consisting of two keywords representing the origin and two offsets from that origin, each given as an absolute length (if given a length), otherwise as a percentage
background-size: as specified, but with relative lengths converted into absolute lengths
background-repeat: a list, each item consisting of two keywords, one per dimension
background-color: If the value is translucent, the computed value will be the rgba() corresponding one. If it isn't, it will be the rgb() corresponding one. The transparent keyword maps to rgba(0,0,0,0).
background-position: yes, as a repeatable list of , a simple list of , a length, percentage or calc(); when both values are lengths, they are interpolated as lengths; when both values are percentages, they are interpolated as percentages; otherwise, both values are converted into a calc() function that is the sum of a length and a percentage (each possibly zero), and these calc() functions have each half interpolated as real numbers.
background-size: yes, as a repeatable list of , a simple list of , a length, percentage or calc(); when both values are lengths, they are interpolated as lengths; when both values are percentages, they are interpolated as percentages; otherwise, both values are converted into a calc() function that is the sum of a length and a percentage (each possibly zero), and these calc() functions have each half interpolated as real numbers. . This means keyword values are not animatable.