Changes

** The challenge with HTML5 audio and video is still the fragmented support for audio and video formats.

** In Firefox browser, the maximum size of each fragment is 75MB. Getting QuotaExceededError if the fragment size is over 75MB.

** Fragmented Video Format - the video MUST be in fragmented format, and this video can be played well.

** Non-fragmented Video - this more general format can be played in MSE way. Browser treats a non-fragment video as a one big fragment file because the maximum size of a non-fragment video is 75MB.

* [https://docs.google.com/presentation/d/1gB41Z6uQQO9C51Ns2aAm2A7vJox0AYt5tz2vyDC0xuo/edit#slide=id.p Cache Architecture study]