A new small feature of Play Icon is recently released by YouTube. According to this feature a small play icon will appear when the video is playing in browser tabs just in between favicon and page title.
Well this seems to be a small feature but actually it is very useful. When a user opens dozen of tabs at the same time to find the actual video but suddenly any tab starts making noise because of auto play option. This Play icon will help you to pin point the annoying tab.
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The Play icon will disappear immediately as you hit pause button in video player or when you finished the video.
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In the above screenshot, the first tab the YouTube homepage is opened, in the second one video is playing so that's why a play icon is visible and, in the last tab video is paused so no icon is visible.
Currently this feature is rolling out gradually so, let us know via comments from where are you and whether you get this addition or not.