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The region is marked as assertive, therefore the user agent should interrupt the user, but it may not do so immediately. This is higher priority than "polite", but it is lower priority than "rude."
After presenting the heading, the user agent should present the text in the live region area at the time. It should then proceed to the "Summary" section followed by the "Description of expected behavior" section. It should then continue to read the filler text until the end of the document and stop. Since there is no more user activity at this point, the current text in the live region area should be announced. In addition, depending on the intended behavior of the user agent, the current text in the live region area should be announced while the user is still reading through the page. One possibility is to announce the update to the text in the live region before starting on a new sentence.
The filler text is here to let developers run their user agents for a longer period of time to make sure that everything will continue to behave as it should. The filler text is here to let developers run their user agents for a longer period of time to make sure that everything will continue to behave as it should. The filler text is here to let developers run their user agents for a longer period of time to make sure that everything will continue to behave as it should. The filler text is here to let developers run their user agents for a longer period of time to make sure that everything will continue to behave as it should.