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[Bug 23812] New: Validator says feComposite needs in2, spec doesn't care, and implementations say it doesn't need in2.

From: <bugzilla@jessica.w3.org>
Date: Tue, 12 Nov 2013 22:24:09 +0000
To: www-validator-cvs@w3.org
Message-ID: <bug-23812-169@http.www.w3.org/Bugs/Public/>
https://www.w3.org/Bugs/Public/show_bug.cgi?id=23812

            Bug ID: 23812
           Summary: Validator says feComposite needs in2, spec doesn't
                    care, and implementations say it doesn't need in2.
           Product: Validator
           Version: HEAD
          Hardware: All
                OS: All
            Status: NEW
          Severity: major
          Priority: P2
         Component: check
          Assignee: dave.null@w3.org
          Reporter: aaron@correspondwith.me
        QA Contact: www-validator-cvs@w3.org

Created attachment 1414
  --> https://www.w3.org/Bugs/Public/attachment.cgi?id=1414&action=edit
An SVG which triggers the issue.

I've noticed when running an svg through the validator, it tells me that in2 is
a required attribute for feComposite.

After reading the appropriate parts of the spec
(http://www.w3.org/TR/SVG/filters.html#feCompositeIn2Attribute), it appears to
be defined to inherit its default from `in', in which case it is not required,
and has defined behaviour (namely considering the immediately preceding filter
primitive's result to be the input). This seems to be the conclusion that
implementors have drawn, since implementations handle it this way as well.

As you can see though, it isn't that way according to the validator.
http://validator.w3.org/unicorn/check?ucn_uri=magnifi.ca%2Fphotos%2Frnd%2Fdms_w3c.svg&tests=markup-validator&warning=1&profile=svg&usermedium=all&ucn_lang=en&ucn_task=custom#

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