diff --git a/include/tidyenum.h b/include/tidyenum.h
index 35fcdc5..a125bce 100644
--- a/include/tidyenum.h
+++ b/include/tidyenum.h
@@ -537,6 +537,7 @@ typedef enum
   TidyAttr_HTTP_EQUIV,        /**< HTTP_EQUIV= */
   TidyAttr_ID,                /**< ID= */
   TidyAttr_ISMAP,             /**< ISMAP= */
+  TidyAttr_ITEMPROP,          /**< ITEMPROP= */
   TidyAttr_LABEL,             /**< LABEL= */
   TidyAttr_LANG,              /**< LANG= */
   TidyAttr_LANGUAGE,          /**< LANGUAGE= */
diff --git a/src/attrdict.c b/src/attrdict.c
index 35e476e..474f134 100644
--- a/src/attrdict.c
+++ b/src/attrdict.c
@@ -4740,6 +4740,7 @@ const AttrVersion TY_(W3CAttrsFor_LINK)[] =
   { TidyAttr_HREF,               HT20|HT32|H40T|H41T|X10T|H40F|H41F|X10F|H40S|H41S|X10S|XH11|XB10|HT50|XH50 },
   { TidyAttr_HREFLANG,           xxxx|xxxx|H40T|H41T|X10T|H40F|H41F|X10F|H40S|H41S|X10S|XH11|XB10|HT50|XH50 },
   { TidyAttr_ID,                 xxxx|xxxx|H40T|H41T|X10T|H40F|H41F|X10F|H40S|H41S|X10S|XH11|XB10|HT50|XH50 },
+  { TidyAttr_ITEMPROP,           xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|HT50|XH50 },
   { TidyAttr_LANG,               xxxx|xxxx|H40T|H41T|X10T|H40F|H41F|X10F|H40S|H41S|X10S|xxxx|xxxx|HT50|XH50 },
   { TidyAttr_MEDIA,              xxxx|xxxx|H40T|H41T|X10T|H40F|H41F|X10F|H40S|H41S|X10S|XH11|XB10|HT50|XH50 },
   { TidyAttr_METHODS,            HT20|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx|xxxx },
diff --git a/src/attrs.c b/src/attrs.c
index f4808fb..85d0751 100644
--- a/src/attrs.c
+++ b/src/attrs.c
@@ -158,6 +158,7 @@ static const Attribute attribute_defs [] =
   { TidyAttr_HTTP_EQUIV,        "http-equiv",            CH_PCDATA    }, /* META */
   { TidyAttr_ID,                "id",                    CH_IDDEF     }, 
   { TidyAttr_ISMAP,             "ismap",                 CH_BOOL      }, /* IMG */
+  { TidyAttr_ITEMPROP,          "itemprop",              CH_PCDATA    }, 
   { TidyAttr_LABEL,             "label",                 CH_PCDATA    }, /* OPT, OPTGROUP */
   { TidyAttr_LANG,              "lang",                  CH_LANG      }, 
   { TidyAttr_LANGUAGE,          "language",              CH_PCDATA    }, /* SCRIPT */
diff --git a/src/attrs.h b/src/attrs.h
index 1668db6..7b06ab4 100644
--- a/src/attrs.h
+++ b/src/attrs.h
@@ -223,6 +223,7 @@ uint TY_(NodeAttributeVersions)( Node* node, TidyAttrId id );
 #define attrIsHTTP_EQUIV(av)        AttrIsId( av, TidyAttr_HTTP_EQUIV  )
 #define attrIsID(av)                AttrIsId( av, TidyAttr_ID  )
 #define attrIsISMAP(av)             AttrIsId( av, TidyAttr_ISMAP  )
+#define attrIsITEMPROP(av)          AttrIsId( av, TidyAttr_ITEMPROP  )
 #define attrIsLABEL(av)             AttrIsId( av, TidyAttr_LABEL  )
 #define attrIsLANG(av)              AttrIsId( av, TidyAttr_LANG  )
 #define attrIsLANGUAGE(av)          AttrIsId( av, TidyAttr_LANGUAGE  )
diff --git a/src/tags.c b/src/tags.c
index 2fc3245..372728c 100644
--- a/src/tags.c
+++ b/src/tags.c
@@ -786,23 +786,21 @@ void CheckTABLE( TidyDocImpl* doc, Node *node )
     }
 }
 
-/* add missing type attribute when appropriate */
+/* report missing href attribute; report missing rel attribute */
 void CheckLINK( TidyDocImpl* doc, Node *node )
 {
-    AttVal *rel = TY_(AttrGetById)(node, TidyAttr_REL);
+    Bool HasHref = TY_(AttrGetById)(node, TidyAttr_HREF) != NULL;
+    Bool HasRel = TY_(AttrGetById)(node, TidyAttr_REL) != NULL;
+    Bool HasItemprop = TY_(AttrGetById)(node, TidyAttr_ITEMPROP) != NULL;
 
-    TY_(CheckAttributes)( doc, node );
-
-    /* todo: <link rel="alternate stylesheet"> */
-    if (AttrValueIs(rel, "stylesheet"))
+    if (!HasHref)
     {
-        AttVal *type = TY_(AttrGetById)(node, TidyAttr_TYPE);
-        if (!type)
-        {
-            TY_(AddAttribute)( doc, node, "type", "text/css" );
-            type = TY_(AttrGetById)(node, TidyAttr_TYPE);
-            TY_(ReportAttrError)( doc, node, type, INSERTING_ATTRIBUTE );
-        }
+      TY_(ReportMissingAttr)( doc, node, "href" );
+    }
+
+    if (!HasItemprop && !HasRel)
+    {
+      TY_(ReportMissingAttr)( doc, node, "rel" );
     }
 }