Earlier quoted context omitted.
Livestream from Apple was OSX-only.
More like Safari-only. I couldn't watch it on Chrome on OSX (unless I changed my user agent to Safari)
While Chrome has supported HLS for a WebM backend for some time now, documentation on their support for HLS with an MP4 backend is unclear. It seems to work now as of Chrome 26, but that wasn't always the case. It also works fine on Android devices past 3.2 because of Google TV.