// notice!! do not use any of this javascript
// it's just junk for our docs!
// ++++++++++++++++++++++++++++++++++++++++++
/*!
 * copyright 2014 twitter, inc.
 *
 * licensed under the creative commons attribution 3.0 unported license. for
 * details, see http://creativecommons.org/licenses/by/3.0/.
 */
// intended to prevent false-positive bug reports about bootstrap not working properly in old versions of ie due to folks testing using ie's unreliable emulation modes.
(function () {
  'use strict';

  function emulatediemajorversion() {
    var groups = /msie ([0-9.]+)/.exec(window.navigator.useragent)
    if (groups === null) {
      return null
    }
    var ieversionnum = parseint(groups[1], 10)
    var iemajorversion = math.floor(ieversionnum)
    return iemajorversion
  }

  function actualnonemulatediemajorversion() {
    // detects the actual version of ie in use, even if it's in an older-ie emulation mode.
    // ie javascript conditional compilation docs: http://msdn.microsoft.com/en-us/library/ie/121hztk3(v=vs.94).htm
    // @cc_on docs: http://msdn.microsoft.com/en-us/library/ie/8ka90k2e(v=vs.94).htm
    var jscriptversion = new function('/*@cc_on return @_jscript_version; @*/')() // jshint ignore:line
    if (jscriptversion === undefined) {
      return 11 // ie11+ not in emulation mode
    }
    if (jscriptversion < 9) {
      return 8 // ie8 (or lower; haven't tested on ie<8)
    }
    return jscriptversion // ie9 or ie10 in any mode, or ie11 in non-ie11 mode
  }

  var ua = window.navigator.useragent
  if (ua.indexof('opera') > -1 || ua.indexof('presto') > -1) {
    return // opera, which might pretend to be ie
  }
  var emulated = emulatediemajorversion()
  if (emulated === null) {
    return // not ie
  }
  var nonemulated = actualnonemulatediemajorversion()

  if (emulated !== nonemulated) {
    //window.alert('warning: you appear to be using ie' + nonemulated + ' in ie' + emulated + ' emulation mode.\nie emulation modes can behave significantly differently from actual older versions of ie.\nplease don\'t file bootstrap bugs based on testing in ie emulation modes!')
  }
})();