Ensure focus is restored to last active element when nav is closed

js/navigation.js

@@ -56,6 +56,7 @@ export default class Navigation {
   }
 
   openNav() {
+    this.lastActiveElement = document.activeElement;
     this.state = 'visible';
     this.menu.hideMenu();
     this.container.classList.add(STATES.open);
@@ -68,5 +69,8 @@ export default class Navigation {
     this.menu.showMenu();
     this.container.classList.remove(STATES.open);
     this.container.setAttribute('aria-hidden', true);
+    if (this.lastActiveElement) {
+      this.lastActiveElement.focus();
+    }
   }
 }

js/navigation.spec.js

@@ -126,12 +126,15 @@ describe('Navigation close button', () => {
 describe('Navigation focus behaviour', () => {
   let first;
   let last;
+  let menu;
 
   beforeEach(() => {
-    nav.init();
-    nav.openNav();
+    menu = nav.container.querySelector('.Menu');
     first = nav.container.querySelector('.Nav-link');
     last = nav.container.querySelector('.Nav-close');
+    menu.focus();
+    nav.init();
+    nav.openNav();
   });
 
   it('Should apply focus to .Nav-titleLink when opened', () => {
@@ -155,4 +158,10 @@ describe('Navigation focus behaviour', () => {
     first.dispatchEvent(event);
     expect(document.activeElement).toBe(last);
   });
+
+  test('Focus is restored to last active element when Navigation is closed', () => {
+    first.focus();
+    nav.closeNav();
+    expect(document.activeElement).toBe(menu);
+  });
 });