Bug 241851

Overview: This situation can occur e.g. if ARIA label text is downloaded from server for chosen site/web app localization and added to markdown some time after page load. Steps to Reproduce: 1). Please use the following code snippet: <p>Text content</p> <section aria-label="First section label"> <h2>First section heading</h2> <p>First section content</p> </section> <section id="second"> <h2>Second section heading</h2> <p>Second section content</p> </section> <script> const section = document.getElementById('second'); setTimeout(() => { section.setAttribute('aria-label', 'Second section label'); }, 500); </script> 2). Open rotor menu by using VO + U key combination, navigate to Landmarks section Actual Results: Region landmark is present only for first section Expected Results: Region landmarks are present for both sections Build Date & Hardware: Safari 15.5 (17613.2.7.1.8) on MacOS Monterey 12.4 Additional Information: Although second section landmark is not added to rotor landmarks menu, it is properly read while traversing the page as region with label.