I am a user who likes to go on multiple chats at a time, and I usually rely on sound for activity. But, when I am focused on one chat, and there is activity going on in another, the online sound and message sound do not make sounds on the other chats that I am NOT currently watching, even though the chat sounds are turned on.
Step 2: Go to another xat chat on HTML5.
Step 3: Go on one of the chats, and have a friend keep coming online and/or sending messages in the other chat (the chat you are NOT currently focused on/watching).
Step 4: There is no sound.