// Valid
<div>
  &nbsp;
  &iexcl;
  &cent;
  &pound;
  &curren;
  &yen;
  &brvbar;
  &sect;
  &uml;
  &copy;
</div>;
<div>
  &ordf;
  &laquo;
  &not;
  &shy;
  &reg;
  &macr;
  &deg;
  &plusmn;
  &sup2;
  &sup3;
</div>;
<div>
  &acute;
  &micro;
  &para;
  &middot;
  &cedil;
  &sup1;
  &ordm;
  &raquo;
  &frac14;
  &frac12;
</div>;
<div>
  &frac34;
  &iquest;
  &Agrave;
  &Aacute;
  &Acirc;
  &Atilde;
  &Auml;
  &Aring;
  &AElig;
  &Ccedil;
</div>;
<div>
  &Egrave;
  &Eacute;
  &Ecirc;
  &Euml;
  &Igrave;
  &Iacute;
  &Icirc;
  &Iuml;
  &ETH;
  &Ntilde;
</div>;
<div>
  &Ograve;
  &Oacute;
  &Ocirc;
  &Otilde;
  &Ouml;
  &times;
  &Oslash;
  &Ugrave;
  &Uacute;
  &Ucirc;
</div>;
<div>
  &Uuml;
  &Yacute;
  &THORN;
  &szlig;
  &agrave;
  &aacute;
  &acirc;
  &atilde;
  &auml;
  &aring;
</div>;
<div>
  &aelig;
  &ccedil;
  &egrave;
  &eacute;
  &ecirc;
  &euml;
  &igrave;
  &iacute;
  &icirc;
  &iuml;
</div>;
<div>
  &eth;
  &ntilde;
  &ograve;
  &oacute;
  &ocirc;
  &otilde;
  &ouml;
  &divide;
  &oslash;
  &ugrave;
</div>;
<div>
  &uacute;
  &ucirc;
  &uuml;
  &yacute;
  &thorn;
  &yuml;
  &fnof;
  &Alpha;
  &Beta;
  &Gamma;
</div>;
<div>
  &Delta;
  &Epsilon;
  &Zeta;
  &Eta;
  &Theta;
  &Iota;
  &Kappa;
  &Lambda;
  &Mu;
  &Nu;
</div>;
<div>
  &Xi;
  &Omicron;
  &Pi;
  &Rho;
  &Sigma;
  &Tau;
  &Upsilon;
  &Phi;
  &Chi;
  &Psi;
</div>;
<div>
  &Omega;
  &alpha;
  &beta;
  &gamma;
  &delta;
  &epsilon;
  &zeta;
  &eta;
  &theta;
  &iota;
</div>;
<div>
  &kappa;
  &lambda;
  &mu;
  &nu;
  &xi;
  &omicron;
  &pi;
  &rho;
  &sigmaf;
  &sigma;
</div>;
<div>
  &tau;
  &upsilon;
  &phi;
  &chi;
  &psi;
  &omega;
  &thetasym;
  &upsih;
  &piv;
  &bull;
</div>;
<div>
  &hellip;
  &prime;
  &Prime;
  &oline;
  &frasl;
  &weierp;
  &image;
  &real;
  &trade;
  &alefsym;
</div>;
<div>
  &larr;
  &uarr;
  &rarr;
  &darr;
  &harr;
  &crarr;
  &lArr;
  &uArr;
  &rArr;
  &dArr;
</div>;
<div>
  &hArr;
  &forall;
  &part;
  &exist;
  &empty;
  &nabla;
  &isin;
  &notin;
  &ni;
  &prod;
</div>;
<div>
  &sum;
  &minus;
  &lowast;
  &radic;
  &prop;
  &infin;
  &ang;
  &and;
  &or;
  &cap;
</div>;
<div>
  &cup;
  &int;
  &there4;
  &sim;
  &cong;
  &asymp;
  &ne;
  &equiv;
  &le;
  &ge;
</div>;
<div>
  &sub;
  &sup;
  &nsub;
  &sube;
  &supe;
  &oplus;
  &otimes;
  &perp;
  &sdot;
  &lceil;
</div>;
<div>
  &rceil;
  &lfloor;
  &rfloor;
  &lang;
  &rang;
  &loz;
  &spades;
  &clubs;
  &hearts;
  &diams;
</div>;
<div>
  &quot;
  &amp;
  &lt;
  &gt;
  &OElig;
  &oelig;
  &Scaron;
  &scaron;
  &Yuml;
  &circ;
</div>;
<div>
  &tilde;
  &ensp;
  &emsp;
  &thinsp;
  &zwnj;
  &zwj;
  &lrm;
  &rlm;
  &ndash;
  &mdash;
</div>;
<div>
  &lsquo;
  &rsquo;
  &sbquo;
  &ldquo;
  &rdquo;
  &bdquo;
  &dagger;
  &Dagger;
  &permil;
  &lsaquo;
</div>;
<div>
  &rsaquo;
  &euro;
</div>;

// Invalid
<div>&donkey;</div>
