Update window.MapML namespace to contain HTMLMapElement, HTMLAreaElement

interfaces, since they won't clash with window.HTMLMap/AreaElement

Author: prushforth

src/mapml/index.js

@@ -54,8 +54,8 @@ import { HTMLInputElement } from '../mapml-viewer';
 import { HTMLSelectElement } from '../mapml-viewer';
 import { HTMLLinkElement } from '../mapml-viewer';
 import { HTMLStyleElement } from '../mapml-viewer';
-import { HTMLWebMapElement } from '../mapml-viewer';
-import { HTMLMapAreaElement } from '../mapml-viewer';
+import { HTMLWebMapElement as HTMLMapElement } from '../mapml-viewer';
+import { HTMLMapAreaElement as HTMLAreaElement } from '../mapml-viewer';
 
 window.MapML = {
   HTMLMapmlViewerElement,
@@ -67,6 +67,6 @@ window.MapML = {
   HTMLSelectElement,
   HTMLLinkElement,
   HTMLStyleElement,
-  HTMLWebMapElement,
-  HTMLMapAreaElement
+  HTMLMapElement,
+  HTMLAreaElement
 };

src/web-map.js

@@ -685,7 +685,7 @@ export class HTMLWebMapElement extends HTMLMapElement {
     this.addEventListener(
       'change',
       function (e) {
-        if (e.target.tagName === 'map-layer') {
+        if (e.target.tagName === 'MAP-LAYER') {
           this.dispatchEvent(
             new CustomEvent('layerchange', {
               details: { target: this, originalEvent: e }