diff --git a/attribute/generated.go b/attribute/generated.go
index 2cc76af..962e34f 100644
--- a/attribute/generated.go
+++ b/attribute/generated.go
@@ -38,22 +38,6 @@ func Action(value string) hatmill.Attrib {
 	}
 }
 
-// Align creates a "align" attribute
-func Align(value string) hatmill.Attrib {
-	return hatmill.Attrib{
-		Key:   "align",
-		Value: value,
-	}
-}
-
-// Allow creates a "allow" attribute
-func Allow(value string) hatmill.Attrib {
-	return hatmill.Attrib{
-		Key:   "allow",
-		Value: value,
-	}
-}
-
 // Alt creates a "alt" attribute
 func Alt(value string) hatmill.Attrib {
 	return hatmill.Attrib{
@@ -99,14 +83,6 @@ func Autoplay() hatmill.Attrib {
 	}
 }
 
-// Challenge creates a "challenge" attribute
-func Challenge(value string) hatmill.Attrib {
-	return hatmill.Attrib{
-		Key:   "challenge",
-		Value: value,
-	}
-}
-
 // Charset creates a "charset" attribute
 func Charset(value string) hatmill.Attrib {
 	return hatmill.Attrib{
@@ -357,14 +333,6 @@ func HttpEquiv(value string) hatmill.Attrib {
 	}
 }
 
-// Icon creates a "icon" attribute
-func Icon(value string) hatmill.Attrib {
-	return hatmill.Attrib{
-		Key:   "icon",
-		Value: value,
-	}
-}
-
 // Id creates a "id" attribute
 func Id(value string) hatmill.Attrib {
 	return hatmill.Attrib{
@@ -373,14 +341,6 @@ func Id(value string) hatmill.Attrib {
 	}
 }
 
-// Integrity creates a "integrity" attribute
-func Integrity(value string) hatmill.Attrib {
-	return hatmill.Attrib{
-		Key:   "integrity",
-		Value: value,
-	}
-}
-
 // Ismap creates a "ismap" attribute
 func Ismap() hatmill.Attrib {
 	return hatmill.Attrib{
@@ -396,14 +356,6 @@ func Itemprop(value string) hatmill.Attrib {
 	}
 }
 
-// Keytype creates a "keytype" attribute
-func Keytype(value string) hatmill.Attrib {
-	return hatmill.Attrib{
-		Key:   "keytype",
-		Value: value,
-	}
-}
-
 // Kind creates a "kind" attribute
 func Kind(value string) hatmill.Attrib {
 	return hatmill.Attrib{
@@ -428,14 +380,6 @@ func Lang(value string) hatmill.Attrib {
 	}
 }
 
-// Language creates a "language" attribute
-func Language(value string) hatmill.Attrib {
-	return hatmill.Attrib{
-		Key:   "language",
-		Value: value,
-	}
-}
-
 // List creates a "list" attribute
 func List(value string) hatmill.Attrib {
 	return hatmill.Attrib{
@@ -459,14 +403,6 @@ func Low(value float32) hatmill.Attrib {
 	}
 }
 
-// Manifest creates a "manifest" attribute
-func Manifest(value string) hatmill.Attrib {
-	return hatmill.Attrib{
-		Key:   "manifest",
-		Value: value,
-	}
-}
-
 // Max creates a "max" attribute
 func Max(value float32) hatmill.Attrib {
 	return hatmill.Attrib{
@@ -699,14 +635,6 @@ func Sizes(value string) hatmill.Attrib {
 	}
 }
 
-// Slot creates a "slot" attribute
-func Slot(value string) hatmill.Attrib {
-	return hatmill.Attrib{
-		Key:   "slot",
-		Value: value,
-	}
-}
-
 // Span creates a "span" attribute
 func Span(value string) hatmill.Attrib {
 	return hatmill.Attrib{
@@ -771,14 +699,6 @@ func Style(value string) hatmill.Attrib {
 	}
 }
 
-// Summary creates a "summary" attribute
-func Summary(value string) hatmill.Attrib {
-	return hatmill.Attrib{
-		Key:   "summary",
-		Value: value,
-	}
-}
-
 // Tabindex creates a "tabindex" attribute
 func Tabindex(value int) hatmill.Attrib {
 	return hatmill.Attrib{
@@ -803,14 +723,6 @@ func Title(value string) hatmill.Attrib {
 	}
 }
 
-// Translate creates a "translate" attribute
-func Translate(value string) hatmill.Attrib {
-	return hatmill.Attrib{
-		Key:   "translate",
-		Value: value,
-	}
-}
-
 // Type creates a "type" attribute
 func Type(value string) hatmill.Attrib {
 	return hatmill.Attrib{
diff --git a/defs.json b/defs.json
index 0560759..e9521fe 100644
--- a/defs.json
+++ b/defs.json
@@ -4,15 +4,12 @@
     {"name": "accept-charset", "type": "string"},
     {"name": "accesskey", "type": "string"},
     {"name": "action", "type": "string"},
-    {"name": "align", "type": "string"},
-    {"name": "allow", "type": "string"},
     {"name": "alt", "type": "string"},
     {"name": "async", "type": "bool"},
     {"name": "autocapitalize", "type": "string"},
     {"name": "autocomplete", "type": "string"},
     {"name": "autofocus", "type": "bool"},
     {"name": "autoplay", "type": "bool"},
-    {"name": "challenge", "type": "string"},
     {"name": "charset", "type": "string"},
     {"name": "checked", "type": "bool"},
     {"name": "cite", "type": "string"},
@@ -45,20 +42,15 @@
     {"name": "href", "type": "string"},
     {"name": "hreflang", "type": "string"},
     {"name": "http-equiv", "type": "string"},
-    {"name": "icon", "type": "string"},
     {"name": "id", "type": "string"},
-    {"name": "integrity", "type": "string"},
     {"name": "ismap", "type": "bool"},
     {"name": "itemprop", "type": "string"},
-    {"name": "keytype", "type": "string"},
     {"name": "kind", "type": "string"},
     {"name": "label", "type": "string"},
     {"name": "lang", "type": "string"},
-    {"name": "language", "type": "string"},
     {"name": "list", "type": "string"},
     {"name": "loop", "type": "bool"},
     {"name": "low", "type": "float"},
-    {"name": "manifest", "type": "string"},
     {"name": "max", "type": "float"},
     {"name": "maxlength", "type": "int"},
     {"name": "media", "type": "string"},
@@ -89,7 +81,6 @@
     {"name": "shape", "type": "string"},
     {"name": "size", "type": "int"},
     {"name": "sizes", "type": "string"},
-    {"name": "slot", "type": "string"},
     {"name": "span", "type": "string"},
     {"name": "spellcheck", "type": "string"},
     {"name": "src", "type": "string"},
@@ -98,11 +89,9 @@
     {"name": "srcset", "type": "string"},
     {"name": "start", "type": "string"},
     {"name": "style", "type": "string"},
-    {"name": "summary", "type": "string"},
     {"name": "tabindex", "type": "int"},
     {"name": "target", "type": "string"},
     {"name": "title", "type": "string"},
-    {"name": "translate", "type": "string"},
     {"name": "type", "type": "string"},
     {"name": "usemap", "type": "string"},
     {"name": "value", "type": "string"},
@@ -173,7 +162,6 @@
     {"name": "map"},
     {"name": "mark"},
     {"name": "math"},
-    {"name": "menu"},
     {"name": "meta", "void": true},
     {"name": "meter"},
     {"name": "nav"},
diff --git a/element/generated.go b/element/generated.go
index fe81e56..9a93088 100644
--- a/element/generated.go
+++ b/element/generated.go
@@ -779,19 +779,6 @@ func Math(attribs ...hatmill.Attrib) func(children ...hatmill.Term) hatmill.Pare
 	}
 }
 
-// Menu creates a <menu> element.
-func Menu(attribs ...hatmill.Attrib) func(children ...hatmill.Term) hatmill.ParentElement {
-	return func(children ...hatmill.Term) hatmill.ParentElement {
-		return hatmill.ParentElement{
-			VoidElement: hatmill.VoidElement{
-				TagName: "menu",
-				Attribs: attribs,
-			},
-			Children: children,
-		}
-	}
-}
-
 // Meta creates a <meta> element.
 func Meta(attribs ...hatmill.Attrib) hatmill.VoidElement {
 	return hatmill.VoidElement{