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http://hg.csswg.org/test/file/fb2ecd565a4f/contributors/opera/incoming/css-device-adapt tests constrain-023.xht constrain-024.xht are about not resolving relative lengths to 0 absolute lengths. The spec doesn't say anything explicit about it. It would be good to clarify the spec as to what the expected behavior should be.
Proposed resolution: http://lists.w3.org/Archives/Public/www-style/2013May/0041.html
Resolved as proposed in the spec and adjusted tests to allow 0 specified and resolved lengths.