[Webkit-unassigned] [Bug 157511] New: Implement CSS background-position-x/-y two-value syntax and edge offsets

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=157511

            Bug ID: 157511
           Summary: Implement CSS background-position-x/-y two-value
                    syntax and edge offsets
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: OS X 10.11
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: 50167214 at qq.com

We must be support two-value syntax and edge offsets for background-position-x/-y.

e.g.

background-position-x: right 30px;
background-position-x: -95px, center, right 30px, ...;

Spec: https://drafts.csswg.org/css-backgrounds-4/#background-position-longhands

MDN: https://developer.mozilla.org/en-US/docs/Web/CSS/background-position-x
https://developer.mozilla.org/en-US/docs/Web/CSS/background-position-y

Browser compatibility

Firefox 49 Yes
IE 9 Yes
Edge Yes
Chrome No
Opera 12.1 No

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