old_contents: /*!
  {
    "name" : "HTML5 Audio Element",
    "property": "audio",
    "aliases" : [],
    "tags" : ["html5", "audio", "media"],
    "doc" : "/docs/#audio",
    "knownBugs": [],
    "authors" : []
  }
  !*/
  define(['Modernizr', 'createElement'], function( Modernizr, createElement ) {
    // This tests evaluates support of the audio element, as well as
    // testing what types of content it supports.
    //
    // We're using the Boolean constructor here, so that we can extend the value
    // e.g.  Modernizr.audio     // true
    //       Modernizr.audio.ogg // 'probably'
    //
    // Codec values from : github.com/NielsLeenheer/html5test/blob/9106a8/index.html#L845
    //                     thx to NielsLeenheer and zcorpan
  
    // Note: in some older browsers, "no" was a return value instead of empty string.
    //   It was live in FF3.5.0 and 3.5.1, but fixed in 3.5.2
    //   It was also live in Safari 4.0.0 - 4.0.4, but fixed in 4.0.5
    Modernizr.addTest('audio', function() {
      /* jshint -W053 */
      var elem = createElement('audio');
      var bool = false;
  
      try {
        if ( bool = !!elem.canPlayType ) {
          bool      = new Boolean(bool);
          bool.ogg  = elem.canPlayType('audio/ogg; codecs="vorbis"').replace(/^no$/,'');
          bool.mp3  = elem.canPlayType('audio/mpeg;')               .replace(/^no$/,'');
  
          // Mimetypes accepted:
          //   developer.mozilla.org/En/Media_formats_supported_by_the_audio_and_video_elements
          //   bit.ly/iphoneoscodecs
          bool.wav  = elem.canPlayType('audio/wav; codecs="1"')     .replace(/^no$/,'');
          bool.m4a  = ( elem.canPlayType('audio/x-m4a;')            ||
                       elem.canPlayType('audio/aac;'))             .replace(/^no$/,'');
        }
      } catch(e) { }
  
      return bool;
    });
  });
  
new_contents: /*!
  {
    "name" : "HTML5 Audio Element",
    "property": "audio",
    "aliases" : [],
    "tags" : ["html5", "audio", "media"],
    "doc" : "/docs/#audio",
    "knownBugs": [],
    "authors" : []
  }
  !*/
  define(['Modernizr', 'createElement'], function( Modernizr, createElement ) {
    // This tests evaluates support of the audio element, as well as
    // testing what types of content it supports.
    //
    // We're using the Boolean constructor here, so that we can extend the value
    // e.g.  Modernizr.audio     // true
    //       Modernizr.audio.ogg // 'probably'
    //
    // Codec values from : github.com/NielsLeenheer/html5test/blob/9106a8/index.html#L845
    //                     thx to NielsLeenheer and zcorpan
  
    // Note: in some older browsers, "no" was a return value instead of empty string.
    //   It was live in FF3.5.0 and 3.5.1, but fixed in 3.5.2
    //   It was also live in Safari 4.0.0 - 4.0.4, but fixed in 4.0.5
    Modernizr.addTest('audio', function() {
      /* jshint -W053 */
      var elem = createElement('audio');
      var bool = false;
  
      try {
        if ( bool = !!elem.canPlayType ) {
          bool      = new Boolean(bool);
          bool.ogg  = elem.canPlayType('audio/ogg; codecs="vorbis"').replace(/^no$/,'');
          bool.mp3  = elem.canPlayType('audio/mpeg;')               .replace(/^no$/,'');
          bool.opus  = elem.canPlayType('audio/ogg; codecs="opus"') .replace(/^no$/,'');
  
          // Mimetypes accepted:
          //   developer.mozilla.org/En/Media_formats_supported_by_the_audio_and_video_elements
          //   bit.ly/iphoneoscodecs
          bool.wav  = elem.canPlayType('audio/wav; codecs="1"')     .replace(/^no$/,'');
          bool.m4a  = ( elem.canPlayType('audio/x-m4a;')            ||
                       elem.canPlayType('audio/aac;'))             .replace(/^no$/,'');
        }
      } catch(e) { }
  
      return bool;
    });
  });
  
subject: add opus detection - fixes #699