src/Test.util.cpp (operator<<(std::ostream&, Node)): Output tag names in lowercase letters for using testdata in html5lib with HTMLParser.test
src/utf.h (toLower, toUpper): Refine
(HTMLScriptElementImp::execute): Refine so that this function can be called without a JS engine
(HTMLParser::Text): Insert characters by a single DOM operation so as not to trigger excessive mutation events.