> Unfortunately that dream has failed to pan out. Instead of proprietary plugins, the web ended up with proprietary video codecs, which has created a split in browser support for HTML5 video. Firefox and Opera support the open Ogg and WebM codecs, while Safari and Internet Explorer supported H.264.

Funny, it looks like a major browser was left out there (in fact the #1 browser in usage according to some metrics).

The article is pretty good overall, but is missing a key piece that is important to understand the background.