Explain the difference between a js button triggering a function and an onload() function running a function.
The notification is already displayed as a number, why display anything once clicking? Why must anything be highlighted? Acknowledged? The notification said 3 so it's the last 3 messages.
The notification said 3 so it's the last 3 messages.
How would you know what kind of notifications (message, mention, post or comment reply, modmail) they are if they automatically get marked as read when you open the PM box?
More icons upfront or a clearer set of drop down trees for each, a hover over effect with options listing numbers of notifications.