I have found the web preview in Textastic to be perfect. I have discovered it will even play local mp4 files so I can create video portfolio websites that will play local HD files through HTML5 so I don't have to worry about an internet connection. The only thing that would make this even more perfect is having a full screen mode with the web preview. Then it would truly make a perfect presentation mode that will be able to play anywhere regardless of signal. Perhaps a 5 finger tap could exit fullscreen mode.
Customer support service by UserEcho