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Query on live region properties


From: Vemaarapu Venkatesh
Date: Jul 20, 2017 10:14PM

Hello all, Warm greetings!

I would like to be clarified on the use of live region properties through
this webaim platform.
Will screen readers announce the whole live region if aria-live is alone
used without setting aria-atomic to true along wit it. Or it is mandatory
to define aria-atomic="true" to make screen readers announce complete live
region and if it is the case what will be the behavior when aria-live alone
used in terms of screen reader announcements?

<div aria-live="assertive" aria-atomic="true"> live region content </div>
<div aria-live="assertive"> live region content </div>
Will these yield same result?