AudioWorkletNode should not be abstract.

dom/src/main/scala/org/scalajs/dom/AudioParamMap.scala

@@ -0,0 +1,14 @@
+/** Documentation is thanks to Mozilla Contributors at https://developer.mozilla.org/en-US/docs/Web/API and available
+  * under the Creative Commons Attribution-ShareAlike v2.5 or later. http://creativecommons.org/licenses/by-sa/2.5/
+  *
+  * Everything else is under the MIT License http://opensource.org/licenses/MIT
+  */
+
+package org.scalajs.dom
+
+import scala.scalajs.js
+import scala.scalajs.js.annotation._
+
+@JSGlobal
+@js.native
+class AudioParamMap extends ReadOnlyMapLike[String, AudioParam] { }

dom/src/main/scala/org/scalajs/dom/AudioWorkletNode.scala

@@ -11,7 +11,7 @@ import scala.scalajs.js.annotation._
 
 @JSGlobal
 @js.native
-abstract class AudioWorkletNode(context: BaseAudioContext, name: String, options: AudioWorkletNodeOptions = js.native)
+class AudioWorkletNode(context: BaseAudioContext, name: String, options: AudioWorkletNodeOptions = js.native)
     extends AudioNode {
 
   val port: MessagePort = js.native

dom/src/main/scala/org/scalajs/dom/RTCStatsReport.scala

@@ -5,6 +5,4 @@ import scala.scalajs.js
 
 //https://www.w3.org/TR/2015/WD-webrtc-20150210/#idl-def-RTCStatsReport
 @js.native
-trait RTCStatsReport extends js.Object {
-  def apply(id: String): RTCStats = js.native
-}
+trait RTCStatsReport extends ReadOnlyMapLike[String, RTCStats] { }

dom/src/main/scala/org/scalajs/dom/ReadOnlyMapLike.scala

@@ -0,0 +1,27 @@
+/** Documentation is thanks to Mozilla Contributors at https://developer.mozilla.org/en-US/docs/Web/API and available
+  * under the Creative Commons Attribution-ShareAlike v2.5 or later. http://creativecommons.org/licenses/by-sa/2.5/
+  *
+  * Everything else is under the MIT License http://opensource.org/licenses/MIT
+  */
+
+package org.scalajs.dom
+
+import scala.scalajs.js
+import scala.scalajs.js.annotation._
+
+@js.native
+trait ReadOnlyMapLike[K, V] extends js.Object {
+
+  @JSBracketAccess
+  def apply(index: K): V = js.native
+
+  /** Returns a boolean indicating whether a value has been associated with the passed key in the Map object or not. */
+  def has(key: K): Boolean = js.native
+
+  def forEach(callbackFn: js.Function2[K, V, Unit]): Unit = js.native
+
+  def size: Int = js.native
+
+  def keys(): js.Iterator[K] = js.native
+
+}