diff --git a/include/mshtmdid.h b/include/mshtmdid.h
index ba8a977..d4a20d6 100644
--- a/include/mshtmdid.h
+++ b/include/mshtmdid.h
@@ -98,6 +98,8 @@
 #define DISPID_DOMTEXTNODE      DISPID_NORMAL_FIRST
 #define DISPID_GENERIC          DISPID_NORMAL_FIRST
 #define DISPID_DOMIMPLEMENTATION  DISPID_NORMAL_FIRST
+#define DISPID_DOCUMENTCOMPATIBLEINFO  DISPID_NORMAL_FIRST
+#define DISPID_DOCUMENTCOMPATIBLEINFOCOLLECTION  DISPID_NORMAL_FIRST
 
 #define DISPID_IE8_ANCHOR        DISPID_IE8_NORMAL_FIRST
 #define DISPID_IE8_AREA          DISPID_IE8_NORMAL_FIRST
@@ -2002,6 +2004,14 @@
 #define DISPID_IHTMLDOMATTRIBUTE2_HASCHILDNODES    DISPID_DOMATTRIBUTE+19
 #define DISPID_IHTMLDOMATTRIBUTE2_CLONENODE        DISPID_DOMATTRIBUTE+20
 
+/* IHTMLDocumentCompatibleInfo */
+#define DISPID_IHTMLDOCUMENTCOMPATIBLEINFO_USERAGENT  DISPID_DOCUMENTCOMPATIBLEINFO
+#define DISPID_IHTMLDOCUMENTCOMPATIBLEINFO_VERSION    DISPID_DOCUMENTCOMPATIBLEINFO+1
+
+/* IHTMLDocumentCompatibleInfoCollection */
+#define DISPID_IHTMLDOCUMENTCOMPATIBLEINFOCOLLECTION_ITEM    DISPID_DOCUMENTCOMPATIBLEINFOCOLLECTION
+#define DISPID_IHTMLDOCUMENTCOMPATIBLEINFOCOLLECTION_LENGTH  DISPID_DOCUMENTCOMPATIBLEINFOCOLLECTION+1
+
 /* IHTMLBodyElement */
 #define DISPID_IHTMLBODYELEMENT_BACKGROUND        DISPID_A_BACKGROUNDIMAGE
 #define DISPID_IHTMLBODYELEMENT_BGPROPERTIES      DISPID_A_BACKGROUNDATTACHMENT
diff --git a/include/mshtml.idl b/include/mshtml.idl
index 6b694e1..e84f485 100644
--- a/include/mshtml.idl
+++ b/include/mshtml.idl
@@ -3686,6 +3686,42 @@
 }
 
 /*****************************************************************************
+ *    IHTMLDocumentCompatibleInfo interface
+ */
+[
+    odl,
+    oleautomation,
+    dual,
+    uuid(3051041a-98b5-11cf-bb82-00aa00bdce0b)
+]
+interface IHTMLDocumentCompatibleInfo : IDispatch
+{
+    [propget, id(DISPID_IHTMLDOCUMENTCOMPATIBLEINFO_USERAGENT)]
+    HRESULT userAgent([retval, out] BSTR *p);
+
+    [propget, id(DISPID_IHTMLDOCUMENTCOMPATIBLEINFO_VERSION)]
+    HRESULT version([retval, out] BSTR *p);
+}
+
+/*****************************************************************************
+ *    IHTMLDocumentCompatibleInfoCollection interface
+ */
+[
+    odl,
+    oleautomation,
+    dual,
+    uuid(30510418-98b5-11cf-bb82-00aa00bdce0b)
+]
+interface IHTMLDocumentCompatibleInfoCollection : IDispatch
+{
+    [propget, id(DISPID_IHTMLDOCUMENTCOMPATIBLEINFOCOLLECTION_LENGTH)]
+    HRESULT length([retval, out] long *p);
+
+    [id(DISPID_IHTMLDOCUMENTCOMPATIBLEINFOCOLLECTION_ITEM)]
+    HRESULT item([in] long i, [retval, out]IHTMLDocumentCompatibleInfo **p);
+}
+
+/*****************************************************************************
  *    DispHTMLDOMTextNode dispinterface
  */
 [