http://dev.w3.org/csswg/css3-background/
3.6 The 'background-position' property
If only one value is specified, the second value is assumed to be 'center'.
3.10 The 'background' shorthand property
p { background: 40% url("chess.png") / 10em gray
round fixed border-box; }
is equivalent to:
...
background-position: 40% 50%;
...
I believe this is incorrect.
The equivalent is
background-position: 40% center;
or
background-position: 40%;
Am I misunderstanding?
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