Hello, sometimes when I view youtube videos in fullscreen, this thing happens. Is this a hardware problem? Strangely enough, taking screenshot using macbook does not display the artifacts, so I have to take this image using my phone.
MacBook Pro (Retina, 13-inch,Early 2015), OS X El Capitan (10.11.1)
Hi, Hamsterkun.
Thank you for visiting Apple Support Communities.
I understand you are experiencing an issue with the display on your MacBook Pro. I would recommend going through the troubleshooting steps in the article below. This may also include reaching out to us via the quoted section below.
If you tried all of these steps for your display and the video issues persist, contact Apple technical support or take your Apple computer to the nearest Apple Store or Apple Authorized Service Provider (AASP) for diagnosis. If you plan to visit an Apple Retail Store, make a reservation at the Genius Bar using http://www.apple.com/retail/geniusbar/ (available in some countries only).
Apple computers: Troubleshooting issues with video on internal or external displays
Cheers
Viewing video in fullscreen causes artifacts?
