 
 <prompt> Fullscreen na also known as <response>: In November 2008, dem add support for 720p HD. At di time wen dem launch 720p, YouTube player change from 4:3 aspect ratio to widescreen 16:9. Wit dis new feature, YouTube start to dey use H.264/MPEG-4 AVC as dia default video compression format. In November 2009, dem add support for 1080p HD. For July 2010, YouTube announce say dem don launch videos for 4K format, wey allow resolution of up to 4096×3072 pixels. For June 2015, dem add support for 8K resolution, with videos dey play for 7680×4320 pixels. 