https://ulagos.cl/english/wp-content/themes/ulagostemplate/js/ie-emulation-modes-warning.js

1// NOTICE!! DO NOT USE ANY OF THIS JAVASCRIPT
2// IT'S JUST JUNK FOR OUR DOCS!
3// ++++++++++++++++++++++++++++++++++++++++++
4/*!
5 * Copyright 2014-2015 Twitter, Inc.
6 *
7 * Licensed under the Creative Commons Attribution 3.0 Unported License. For
8 * details, see https://creativecommons.org/licenses/by/3.0/.
9 */
10// 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.
11(function () {
12  'use strict';
13
14  function emulatedIEMajorVersion() {
15    var groups = /MSIE ([0-9.]+)/.exec(window.navigator.userAgent)
16    if (groups === null) {
17      return null
18    }
19    var ieVersionNum = parseInt(groups[1], 10)
20    var ieMajorVersion = Math.floor(ieVersionNum)
21    return ieMajorVersion
22  }
23
24  function actualNonEmulatedIEMajorVersion() {
25    // Detects the actual version of IE in use, even if it's in an older-IE emulation mode.
26    // IE JavaScript conditional compilation docs: https://msdn.microsoft.com/library/121hztk3%28v=vs.94%29.aspx
27    // @cc_on docs: https://msdn.microsoft.com/library/8ka90k2e%28v=vs.94%29.aspx
28    var jscriptVersion = new Function('/*@cc_on return @_jscript_version; @*/')() // jshint ignore:line
29    if (jscriptVersion === undefined) {
30      return 11 // IE11+ not in emulation mode
31    }
32    if (jscriptVersion < 9) {
33      return 8 // IE8 (or lower; haven't tested on IE<8)
34    }
35    return jscriptVersion // IE9 or IE10 in any mode, or IE11 in non-IE11 mode
36  }
37
38  var ua = window.navigator.userAgent
39  if (ua.indexOf('Opera') > -1 || ua.indexOf('Presto') > -1) {
40    return // Opera, which might pretend to be IE
41  }
42  var emulated = emulatedIEMajorVersion()
43  if (emulated === null) {
44    return // Not IE
45  }
46  var nonEmulated = actualNonEmulatedIEMajorVersion()
47
48  if (emulated !== nonEmulated) {
49    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!')
50  }
51})();