/src/main/java/org/htmlunit/html/xpath/XPathAdapter.java
if ( '\uf900' <= ch) {
if ( state == STATE.ATTRIB ) {
&& state != STATE.DOUBLE_QUOTED) { charArray[i] = Character.toLowerCase(ch); } else if (state == STATE.ATTRIB) { charArray[i] = Character.toLowerCase(ch); } <extra_id_0> final boolean isValidAttribChar = ('a' <= ch && ch <= 'z') || ('A' <= ch && ch <= 'Z') || ('0' <= ch && ch <= '9') || ('\u00C0' <= ch && ch <= '\u00D6') || ('\u00D8' <= ch && ch <= '\u00F6')