Is background-position-x (background-position-y) a standard W3C CSS property?

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Splitting background-position into -x and -y was proposed for CSS 3 but it got rejected as the working group “considered the use case too weak to introduce new properties for.” Additionally, there seemed to be some ambiguity concerns with multiple background images and CSSOM, the API behind CSS. I’m not sure how WebKit and Trident did implement them and how they addressed these concerns.

The CSS WG blob has just reported yesterday that there will be “no change to background-position or transform-origin syntaxes.” The reason is probably due to not getting any further delays.

Maybe it will get added to CSS 4. There is a current thread on the [email protected] mailing list that you might find interesting.

Update    So apparently these properties have been approved for CSS 4 (see [CSSWG] Minutes Telecon 2014-04-16):

RESOLVED: background-position-x/-y, background-repeat-x/-y approved for level 4 of backgrounds and borders.

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