[Webkit-unassigned] [Bug 186965] New: transform-origin should not accept 4 lengths

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=186965

            Bug ID: 186965
           Summary: transform-origin should not accept 4 lengths
           Product: WebKit
           Version: Safari 11
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ericwilligers at chromium.org

transform-origin accepts 1, 2, or 3 values.
https://drafts.csswg.org/css-transforms/#propdef-transform-origin

Unfortunately, WebKit allows '1px 2px 3px 4x' and silently discards the last length.

Example:
http://jsfiddle.net/ericwilligers/me38g7ax/

Found while preparing Web Platform Test
https://github.com/web-platform-tests/wpt/pull/11633

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