Implement accessibleName and helpText in ABSwitch, see phetsims/scene…

…ry-phet#880

js/ABSwitch.ts

@@ -13,7 +13,7 @@ import Property from '../../axon/js/Property.js';
 import TEmitter from '../../axon/js/TEmitter.js';
 import InstanceRegistry from '../../phet-core/js/documentation/InstanceRegistry.js';
 import optionize, { combineOptions } from '../../phet-core/js/optionize.js';
-import { AlignBox, AlignGroup, HBox, HBoxOptions, Node, PressListener, SceneryConstants } from '../../scenery/js/imports.js';
+import { AlignBox, AlignGroup, HBox, HBoxOptions, Node, ParallelDOM, PressListener, SceneryConstants } from '../../scenery/js/imports.js';
 import Tandem from '../../tandem/js/Tandem.js';
 import sun from './sun.js';
 import ToggleSwitch, { ToggleSwitchOptions } from './ToggleSwitch.js';
@@ -118,6 +118,10 @@ export default class ABSwitch<T> extends HBox {
 
     super( options );
 
+    // pdom - Setting accessibleName and helpText on ABSwitch forwards the values to the actual ToggleSwitch.
+    ParallelDOM.forwardAccessibleName( this, toggleSwitch );
+    ParallelDOM.forwardHelpText( this, toggleSwitch );
+
     this.property = property;
     this.valueA = valueA;
     this.valueB = valueB;