docs: port accessibility app from stackblitz to aio (#32377)

Fixes #32320

PR Close #32377

aio/content/examples/accessibility/e2e/src/app.e2e-spec.ts

@@ -0,0 +1,21 @@
+'use strict'; // necessary for es6 output in node
+
+import { browser, element, by } from 'protractor';
+
+describe('Accessibility example e2e tests', () => {
+
+  beforeEach(() => {
+    browser.get('');
+  });
+
+  it('should display Accessibility Example', function () {
+    expect(element(by.css('h1')).getText()).toEqual('Accessibility Example');
+  });
+
+  it('should take a number and change progressbar width', function () {
+    element(by.css('input')).sendKeys('16');
+    expect(element(by.css('input')).getAttribute('value')).toEqual('016');
+    expect(element(by.css('app-example-progressbar div')).getCssValue('width')).toBe('48px');
+  });
+
+});