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Line 75 in Knockout.java references ko attributes without preventing obfuscation of those values: https://github.com/jtulach/html-java-api/blob/1ea6df9722260019772474840c908b7ed571affa/ko4j/src/main/java/org/netbeans/html/ko4j/Knockout.java#L75
Fixed in https://github.com/jtulach/html-java-api/commit/e6b516259e844850896cb34ba8de13ed57c4c9bf to be released in 1.4 version.