Fixed bug

src/parameters/contracts.js

         new Param("br-landscapetable",["table"]),
         new Param("br-transformrotate",["div", "table"]),
         new Param("br-isolatedlandscape",["div", "table"]),
-        new Param("br-hidechildren",["div"]),
+        new Param("br-hidechildren",["div", "th", "tr"]),
         new Param("br-root",["div"])
     ];
 }