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  <video>
    * MP4 H.264 playback support, using hardware or software decoding
    * Support for WebM software is not included in this release

  <audio>
    * MP3 and AAC audio support
Somehow, I'm not surprised that Microsoft once again chooses to be different from everybody else. I can encode in Vorbis and Theora/VP8 for Chrome and Firefox, or MP3 and H.264 for IE9, but there's no set of codecs which works on all three major browsers.



Microsoft, Apple, and Nokia all seem to have the same policy on <video>.


The only browsers which matter are IE, Chrome, and Firefox. The market share of every other browser might as well be a rounding error.


You're ignoring mobile.


iPhone definitely matters. Which means Safari.


According to W3Counter[1], the iPhone OS has 0.83% market share among web browsers. Even assuming every single user is using the built-in browser, that's less market share than even Opera.

So, no, the iPhone does not matter.

[1] http://www.w3counter.com/globalstats.php


W3Counter is just one way of measuring/estimating general browser usage world wide, with the emphasis on "general". It may or may not be relevant to your business needs. The only way to know is measure what is hitting your site(s). In our case we are now getting 17.2% Safari (and growing); and we don't even intentionally target iPhone.


Safari and to a lesser extent, Opera, definitely matter as well.


Chrome supports H.264. Firefox is the one being different.


Opera supports the exact same set of codecs as Firefox. You're the one being different. ;)


That isn't different from everybody else. That's the same as Apple.


What does Safari and Opera do?


Safari uses Quicktime, so it plays Theora fine if you have Theora installed for Quicktime. It will support WebM the same way.




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