Saxon

The MetaTagAdjuster (used on the HTML serialization pipeline) contains the logic

for (NamespaceBinding ns : namespaceBindings) {
            if (inMetaTag) {
                namespaces.add(ns);
            } else {
                nextReceiver.namespace(namespaceBindings, properties);
            }
        }

which is clearly wrong when namespaceBindings contains more than one namespace; in line 5 namespaceBindings should be ns. We're only getting away with this because most paths send namespaces down the pipeline one at a time. Failure observed when we change that on the development branch.