Maybe you have already noticed it. For a long while, I was asking myself what is the role of this tiny yellow bar in the Youtube video player.
After some research on the web, I found that it is for indicates the user when a popup will arrive on the screen (in Youtube term, popup means ‘advertissement’ 🙂 )
Voila! It was the useless post of the day. If you really want some Youtube’s secrets and tricks, check this link!