OWA: `#app` has `aria-hidden="true"` attribute which can lead to accessibility issues

[nikolasalim]

Your Environment

• Platform [PC desktop, Mac, iOS, Office on the web]: OWA
• Browser (if using Office on the web): Chrome v133.0.6943.127

Context/behavior

Multiple Playwright e2e tests started failing a few days ago. They're failing because elements located via getRoleBy aren't found anymore within the compose area. After a closer look, we noticed that the #app div that wraps the whole application now has a aria-hidden="true" attribute, which prevents elements from being found by Playwright and screen readers.

More importantly than the unexpected e2e errors, I believe this can further lead to accessibility issues.

Inspection steps

1. Login to OWA
2. Compose a new message
3. Open devtools and inspect elements
4. Find the #app element

[nikolasalim]

Following up on this: is this the expected behaviour?