Safari expands frameset larger than viewport on iPhone and iPad

I have 3 frames that appear correctly on the screen in Windows, Android and Mac (laptop), but not on iPhone and iPad, Safari expands frameset larger than viewport. That can be seen at: [login to view URL] The source files can be download at: [login to view URL] I am waiting for the correct html files. The next project will be "How to synchronize text and audio?" at [login to view URL] A good example is at [login to view URL] (transcript button) or Youtube (More > Transcript). I am waiting for a good proposal solution for synchronize text and audio for [login to view URL] Thanks, Ion Stanca