In 2007, YouTube offered videos in HTML5 format to support the iPhone and iPad, which did not support Flash Player.[8] After a controversy with Apple, Adobe stopped developing Flash Player for Mobile, focusing its efforts on Adobe AIR applications and HTML5 animation.[8] In 2015, Google introduced Google Swiffy, a tool that converted Flash animation to HTML5, which Google used to automatically convert Flash web ads for mobile devices.[13] In 2016, Google discontinued Swiffy and its support.[14] In 2015, YouTube switched to HTML5 technology on most devices by default;[15][16][17] however, YouTube supported the Flash-based video player for older web browsers and devices until 2017.[18]