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| // 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).aspx | |
| // @cc_on docs: http://msdn.microsoft.com/en-us/library/ie/8ka90k2e(v=vs.94).aspx | |
| 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!') | |
| } | |
| })(); |