first chunk of interfaces that are valid via dart analyzer

modules/facade/src/dom.es6

@@ -0,0 +1,19 @@
+export var DocumentFragment = window.DocumentFragment;
+export var Node = window.Node;
+export var Element = window.HTMLElement;
+export var TemplateElement = window.HTMLTemplateElement;
+
+export class DOM {
+  static query(selector) {
+    return document.querySelector(selector);
+  }
+  static on(el, evt, listener) {
+    el.addEventListener(evt, listener, false);
+  }
+  static getInnerHTML(el) {
+    return el.innerHTML;
+  }
+  static setInnerHTML(el, value) {
+    el.innerHTML = value;
+  }
+}