[css3-background] background-position computed value

http://www.w3.org/TR/css3-background/#the-background-position

Computed value:         If one or two values are specified, for a <length> the absolute length, otherwise a percentage. If three or four values are specified, two pairs of a keyword plus a length or percentage.

background-position: right 1px bottom 3px, 10em bottom, bottom, left 27px bottom 5px, 27px center, 50% center, center 5px, right 5% bottom 10%;

What's the computed value for this example?


(A)
background-position: right 1px bottom 3px, 12345px 100%, 50% 100%, left 27px bottom 5px, 27px, 50%, 50% 5px, right 5% bottom 10%, right 5px bottom 10%, left 5px bottom 10%;

(B)
background-position: right 1px bottom 3px, 12345px 100%, 50% 100%, left 27px bottom 5px, 27px, 50%, 50% 5px, 95% 90%, right 5px bottom 10%, 5px 90%;

(C)
Something else?


Note: The "12345px" occurrences in the above are a placeholder for the computed value of "10em".