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==Competition==
The adoption of HTML5 audio, as with HTML5 video, has become polarised between proponents of free and patented formats.
[[Apple Inc.|Apple]] and [[Microsoft]], which between them account for around 39% of the browser market, support the [[Technical standard|industry standard]], [[ISO|ISO defined]] formats of [[AAC]] and the older [[MP3]]. They cite superior performance, and the risk of a [[submarine patent]] attack from formats which are believed, but not guaranteed, to be 'free'.
[[Mozilla]] and [[Opera]], controlling 24% of the market, support the [[Free software|free]] and [[Open-source software|open]] [[Vorbis]] and [[WebM]] formats, and criticise the patent-encumbered nature of AAC. The [[proprietary]] nature of the [[Vorbis]] format - it is controlled by [[Xiph.org]] - has also been been criticised, however. In 2007, the recommendation to use [[Vorbis]] was retracted by the [[W3C]], citing risks over unknown patents.
[[Google]], controlling 27% of the market, has so far provided support for all common formats.
The result is that for a website to guarantee HTML5 audio for all users, it has to make two formats available, often [[Vorbis]], as used on Wikipedia, and [[AAC]].
==See also==
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