Add back ElementTagNameMap

Author: mhegazy

TS.fsx

@@ -831,6 +831,10 @@ module Emit =
         Pt.Printl "}"
         Pt.Printl ""
 
+    let EmitElementTagNameMap () =
+        Pt.Printl "interface ElementTagNameMap extends HTMLElementTagNameMap, SVGElementTagNameMap { }"
+        Pt.Printl ""
+
     /// Emit overloads for the createEvent method
     let EmitCreateEventOverloads (m: Browser.Method) =
         if matchSingleParamMethodSignature m "createEvent" "Event" "string" then
@@ -1514,6 +1518,7 @@ module Emit =
         if flavor <> Worker then
             EmitHTMLElementTagNameMap()
             EmitSVGElementTagNameMap()
+            EmitElementTagNameMap()
             EmitNamedConstructors()
 
         match GetGlobalPollutor flavor with

baselines/dom.generated.d.ts

@@ -15029,6 +15029,8 @@ interface SVGElementTagNameMap {
     "view": SVGViewElement;
 }
 
+interface ElementTagNameMap extends HTMLElementTagNameMap, SVGElementTagNameMap { }
+
 declare var Audio: { new(src?: string): HTMLAudioElement; };
 declare var Image: { new(width?: number, height?: number): HTMLImageElement; };
 declare var Option: { new(text?: string, value?: string, defaultSelected?: boolean, selected?: boolean): HTMLOptionElement; };