Why don't sounds work on ajax request in opera?

Question

Opera

I send a request to the database every 30 seconds through setinterval to check for new records, and if the record is found, I output the record and the sound of the notification.
When adding records - the sound appears only when the tab is active. What could be the problem?

Answer 1

Browsers significantly slow down the execution of setInterval and setTimeout in inactive tabs. Most likely, this is the issue.