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+++ This bug was initially created as a clone of Bug #24174 +++ The XML specification forbids < in attribute values. Source 1: see the grammar for AttValue below. http://www.w3.org/TR/REC-xml/#sec-common-syn Source 2: http://www.w3.org/TR/REC-xml/#CleanAttrVals The XML serialization algorithm in the DOM Parsing and Serialization specification can produce < in XML attribute values. https://dvcs.w3.org/hg/innerhtml/raw-file/tip/index.html#dfn-concept-serialize-xml-attributes Specifically, step 2 substep 4 only quotes " and &. It should also quote < as <.
:-) *** This bug has been marked as a duplicate of bug 24174 ***