/src/main/java/org/htmlunit/html/xpath/XPathAdapter.java
if ( !isValidAttribChar) {   state = DEFAULT; }
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else if (state == STATE.DOUBLE_QUOTED) { state = STATE.DEFAULT; } break; case '\'': if (state == STATE.DEFAULT || state == STATE.ATTRIB) { <extra_id_0> } else if (state == STATE.SINGLE_QUOTED) { state = STATE.DEFAULT; } break; case '[':