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[[Apple Inc.|Apple]] and [[Microsoft]] support the [[International Organization for Standardization|ISO]]/[[International Electrotechnical Commission|IEC]]-[[technical standard|defined]] formats [[Advanced Audio Coding|AAC]] and the older [[MP3]]. [[Mozilla]] and [[Opera Software|Opera]] support the free and [[Open-source software|open]], [[royalty-free]] [[Vorbis]] format in [[Ogg]] and [[WebM]] containers, and criticize the patent-encumbered nature of MP3 and AAC, which are guaranteed to be “non-free”. [[Google]] has so far provided support for all common formats.
Most AAC files with finite length are wrapped in an MPEG-4 container (.mp4, .m4a), which is supported natively in Internet Explorer, Safari, and Chrome, and supported by the OS in Firefox and Opera.
Many browsers also support uncompressed [[PCM]] audio in a [[WAV]]E container.<ref name="auto">{{Cite web|url=https://developer.mozilla.org/en-US/docs/Web/Media/Formats|title=Media type and format guide: image, audio, and video content – Web media technologies | MDN|website=developer.mozilla.org}}</ref>
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