[Webkit-unassigned] [Bug 119712] New: Remove support for 'pixel' and 'pos' CSSOM prefixes

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=119712

           Summary: Remove support for 'pixel' and 'pos' CSSOM prefixes
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Keywords: BlinkMergeCandidate, WebExposed
          Severity: Normal
          Priority: P2
         Component: CSS
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: rniwa at webkit.org
                CC: hyatt at apple.com, bdakin at apple.com,
                    simon.fraser at apple.com, dino at apple.com,
                    jonlee at apple.com


Consider merging https://chromium.googlesource.com/chromium/blink/+/7cb1d002fd79604c9e8d0bd810ba6f8f21ca78af

These prefixes are:

1. Non-standard: the CSSOM standard doesn't mention them.

2. Broken: 'pixelWidth' should automagically convert from whatever unit the
   stylesheet specified into CSS pixels[1]. We're currently not doing that at
   all: if an element has a 'width' of 100em, pixelWidth is '100', which is
   probably wildly inaccurate.

3. Not covered by any tests ('fast/dom/CSSStyleDeclaration/css-properties-case-sensitive.html'
   is the only test mentioning these properties, and it only checks
   case-sensitivity: it doesn't validate behavior).

This patch drops support completely.

[1]: http://msdn.microsoft.com/en-us/library/ie/ms531135(v=vs.85).aspx

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