Background-position related CSS properties issue

Background-position related CSS properties issue


I was trying to access the `background-position-x` and `*-y`
properties for an element with an offset background image, but found
that the property is blank without first setting "background-
position", eg:
<div id="a" style="background: url('images/my_image.jpg') -50px 12px
no-repeat transparent; height: 30px; width: 200px;"></div>
$("#a").css("background") # returns blank
$("#a").css("background-image") # returns "url('images/
my_image.jpg')"
$("#a").css("background-position") # returns blank
$("#a").css("background-position", "-50px 0") # set the
background position, returns the jQuery object (obviously)
$("#a").css("background-position") # still returns blank
$("#a").css("background") # returns "-50px 0pt"
Is this something that's been overlooked or does this not belong in
the core?
Best regards,
-Klmn