Issue #3259480: Make countdown message screen reader compatible

Closes #3259480

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• dc71c742...3e19e130 - 3 commits from branch project:3.x
• 06335f04 - Merge branch '3.x' into '3259480-make-countdown-message'

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• 48e66f33 - Increase test coverage

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• 365cbf0a - Improve tests

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added 8 commits

• 365cbf0a...bb2ea3f2 - 5 commits from branch project:3.x
• b0acde9b - Issue #3259480: Make countdown message screen reader compatible
• 7371d34a - Increase test coverage
• 9297b7f7 - Improve tests

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• e1843c7d - Issue #3259480: Clean up.

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• b395e7d1 - Issue #3259480: Clean up test.
• 54a00af7 - Issue #3259480: Adapt tests to mitigate issue with source element update when...

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