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According to its description, the test verifies that there are no siblings in the node-set matched by "//text()". However, the actual success conditions appear to be that both previous and next siblings of each node in the node-set are also in node-set - i.e., the condition is negated. See also WebKit bug <http://bugs.webkit.org/show_bug.cgi?id=12560> - with this issue corrected, the test now passes in WebKit and Opera implementations, which it didn't do.