[Webkit-unassigned] [Bug 222189] New: AX: Repeated message to live region is not read out when alternating live regions are used

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=222189

            Bug ID: 222189
           Summary: AX: Repeated message to live region is not read out
                    when alternating live regions are used
           Product: WebKit
           Version: Safari 14
          Hardware: Mac (Intel)
                OS: macOS 10.15
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Accessibility
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: cwalia at slack-corp.com
                CC: webkit-bug-importer at group.apple.com

**Overview:**

When using alternating aria-live regions to announce messages to users on screen reader (common approach for this purpose), a repeated announcement to a specific region is not read out.

**Steps to Reproduce:**

1. Open this Codepen: https://codepen.io/cw22/pen/JjbGbYb
2. Enable VoiceOver
3. Click Button 5, “Send Repeated Message to Alternating Live Region”
4. Notice that “Hello, world” is announced successfully
5. Click Button 5, “Send Repeated Message to Alternating Live Region”
6. Notice that “Hello, world” is announced successfully
7. Click Button 5, “Send Repeated Message to Alternating Live Region”
8. **Issue:** Notice that “Hello, world” is not announced successfully
9. Click Button 6, “Send Unique Message to Alternating Live Region”
10. Notice that “Hello #1” is announced successfully
11. Click Button 6, “Send Unique Message to Alternating Live Region”
12. Notice that “Hello #2” is announced successfully
13. Click Button 6, “Send Unique Message to Alternating Live Region”
14. Notice that “Hello #3” is announced successfully

**Actual Result:**

In Step 8, the live region text value goes from "" to "Hello, World!", so based on the implied aria-relevant value of "additions text", "Hello, World!" should be read out.

**Expected Result:**

In Step 8, "Hello, world" is never read out by VoiceOver.

**Build Date & Hardware**

MacBook Pro (16-inch, 2019)
MacOS Catalina 10.15.7 (19H512)
Safari Version 14.0.2 (15610.3.7.1.10, 15610)

**Additional Builds and Platforms:**

- Firefox Mac OS: FAIL (VoiceOver)
- Chrome Mac OS: FAIL (VoiceOver)
- Chrome Windows: SUCCESS (JAWS & NVDA)
- Firefox Windows: SUCCESS (JAWS & NVDA)

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