<#> should be an invalid tag

object.js

@@ -82,6 +82,10 @@ LStack.prototype.curr = function() {
 	return this._first.o;
 };
 
+LStack.prototype.next = function() {
+	return this._first?.n?.o;
+};
+
 LStack.prototype.empty = function() { return !this._first; }
 
 module.exports = {

string.js

@@ -51,11 +51,14 @@ module.exports = {
 		for( let i = 0; i < l; i ++ )
 		{
 			let c = str[i];
-			let t, _a, _n;
+			let t = "", _a, _n;
 			if( c === _OP )
 			{
-				t = str[ ++i ];
+				let closeTag = ( str[ i + 1 ] === "/" );
-				let closeTag = ( t === "/" );
+				if( closeTag )
+				{
+					t = str[ ++i ];
+				}
 
 				for(
 					_a = str[ ++i ], _n = _a.charCodeAt(0);
@@ -64,13 +67,32 @@ module.exports = {
 					i ++, _a = str[i], _n = _a.charCodeAt(0)
 				) t += _a;
 
+				if( t === "" || t === "/" )
+				{
+					// Hits "<#" where # is not a valid tag name
+					_fd( t + _a );
+					continue;
+				}
+
 				if( _a === _ED )
 				{
 					// Hits "</abcd>"
 					if( closeTag )
 					{
+						// Hits "...</abcd>" with no corresponding open tag
+						if( tokenStack.empty() )
+						{
+							if( _fineHandlers.UnmatchedCloseTag )
+							{
+								_fineHandlers.UnmatchedCloseTag( ctx, t.substr( 1 ) );
+							}
+							else
+							{
+								throw new Error( `Syntax Error: Unexpected closing ${_OP}${t}${_ED}` );
+							}
+						}
 						// Hits "<abcd...>...</abcd>"
-						if( t.substr( 1 ) === tokenStack.curr().name )
+						else if( t.substr( 1 ) === tokenStack.curr().name )
 						{
 							let st = tokenStack.pop();
 							_fd = tokenStack.empty() ? _fd_strOut : tokenStack.curr().fd;
@@ -80,7 +102,14 @@ module.exports = {
 						// Hits "<abcd>...</efgh>"
 						else
 						{
-							throw new Error( `Syntax error: Unexpected closing ${_OP}${t}> after opened ${_OP}${tokenStack.curr().name}${_ED}` );
+							if( _fineHandlers.UnmatchedCloseTag )
+							{
+								_fineHandlers.UnmatchedCloseTag( ctx, t.substr( 1 ) );
+							}
+							else
+							{
+								throw new Error( `Syntax error: Unexpected closing ${_OP}${t}${_ED} after opened ${_OP}${tokenStack.curr().name}${_ED}` );
+							}
 						}
 					}
 					// Hits "<abcd>"
@@ -121,6 +150,8 @@ module.exports = {
 						// Write #... into abcd's attrs
 						tokenStack.curr().attrs = t;
 						_fd = tokenStack.curr().fd;
+
+						_fineHandlers.TagOpen && _fineHandlers.TagOpen( ctx );
 						continue;
 					}
 				}