Welcome to the E-Learning Heroes community, Smita! We're glad you're here. 😀
The behavior you described is not the expected behavior. When you navigate away from the tab, the audio should pause.
I'd like to understand your testing procedure better. Do you publish to LMS and open the story.html file directly in a browser? Published LMS outputs are meant to be uploaded to an LMS to work correctly. What happens if you upload the published output to an LMS? You can use SCORM Cloud as a testing LMS.
I'm looking forward to hearing from you.
