8.8. Do not automatically trigger the sound
Do not automatically trigger a sound that lasts more than three seconds.
It is strongly recommended not to include sounds that are triggered automatically. Some users will be disconcerted by a sound that is launched without any action on their part, and it may be difficult to find the source of the sound when several tabs are open. Other users will simply be blocked—users of voice synthesisers will no longer be able to continue navigating, for example.