diff --git a/src/parser.c b/src/parser.c
index cef6d27..aad2d14 100644
--- a/src/parser.c
+++ b/src/parser.c
@@ -287,7 +287,9 @@ static Bool CanPrune( TidyDocImpl* doc, Node *element )
     /* fix for ISSUE #7 https://github.com/w3c/tidy-html5/issues/7 */
     if (nodeIsCANVAS(element))
         return no;
-
+    
+    if (nodeIsPROGRESS(element))
+        return no;
 
     if ( attrGetID(element) || attrGetNAME(element) )
         return no;
diff --git a/src/tags.h b/src/tags.h
index c45072f..4902113 100644
--- a/src/tags.h
+++ b/src/tags.h
@@ -231,5 +231,6 @@ uint TY_(nodeHeaderLevel)( Node* node );  /* 1, 2, ..., 6 */
 #define nodeIsMENU( node )       TagIsId( node, TidyTag_MENU )
 #define nodeIsBUTTON( node )     TagIsId( node, TidyTag_BUTTON )
 #define nodeIsCANVAS( node )     TagIsId( node, TidyTag_CANVAS )
+#define nodeIsPROGRESS( node )   TagIsId( node, TidyTag_PROGRESS )
 
 #endif /* __TAGS_H__ */