Adobe Flash Player
Steve Jobs also claimed that a large percentage of the video on the Internet is supported on iOS, since many popular video sharing websites such as YouTube have published video content in an HTML5 compatible format, enabling videos to playback in mobile web browsers even without Flash Player.
VBOX7
Now, Vbox7 uses HTML-5 video player and H.264/MPEG-4 AVC is its default video compression format. The site supports HD videos up to 720p.