private boolean equalsIgnoreAsciiCase(CharSequence one, CharSequence other) {
        if (other == null && one == null) {
            return true;
        }
        if (other == null || one == null) {
            return false;
        }
        if (one.length() != other.length()) {
            return false;
        }
        for (int i = 0; i < other.length(); i++) {
            char c0 = one.charAt(i);
            if (c0 >= 'A' && c0 <= 'Z') {
                c0 += 0x20;
            }
            char c1 = other.charAt(i);
            if (c1 >= 'A' && c1 <= 'Z') {
                c1 += 0x20;
            }
            if (c0 != c1) {
                return false;
            }
        }
        return true;
    }
-1 at start
0 in html
>=1 in head
-2 situation over
src/nu/validator/xml/BaseUriTracker.java