Test introduced in r149388. Middle rectangle is not blue, but green on Qt.
Skipped on Qt in http://trac.webkit.org/changeset/149484. Please unskip it when it fixed.
Actually there will be platform-specific behaviors here. I guess the reference should be platform-specific (if that's possible).
=== Bulk closing of Qt bugs === If you believe that this bug report is still relevant for a non-Qt port of webkit.org, please re-open it and remove [Qt] from the summary. If you believe that this is still an important QtWebKit bug, please fill a new report at https://bugreports.qt-project.org and add a link to this issue. See http://qt-project.org/wiki/ReportingBugsInQt for additional guidelines.