我担心 background-position-x 和 background-position-y 。 Gecko（Firefox）和Presto（Opera）不支持它们，但Webkit（Chrome，Safari）... ...
有没有人知道
background-position-x
code>和 background-position-y 现在是。
I'm worried about background-position-x and background-position-y. Gecko (Firefox) and Presto (Opera) don't support them, but Webkit (Chrome, Safari) does...
Does anyone know (with official references) if this is (or will be) included in the standard?
background-position-x and background-position-y are now part of the level 4 of Backgrounds and Borders standard.
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