1 files changed, 52 insertions, 0 deletions
diff --git a/vendor/twbs/bootstrap/site/assets/js/ie-emulation-modes-warning.js b/vendor/twbs/bootstrap/site/assets/js/ie-emulation-modes-warning.js
new file mode 100644
index 000000000..d11ec1c5a
--- /dev/null
+++ b/vendor/twbs/bootstrap/site/assets/js/ie-emulation-modes-warning.js
@@ -0,0 +1,52 @@
+// NOTICE!! DO NOT USE ANY OF THIS JAVASCRIPT
+// IT'S ALL JUST JUNK FOR OUR DOCS!
+// ++++++++++++++++++++++++++++++++++++++++++
+
+// 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 ([\d.]+)/.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: https://msdn.microsoft.com/library/121hztk3%28v=vs.94%29.aspx
+    // @cc_on docs: https://msdn.microsoft.com/library/8ka90k2e%28v=vs.94%29.aspx
+    var jscriptVersion = new Function('/*@cc_on return @_jscript_version; @*/')() // eslint-disable-line no-new-func
+    if (typeof 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) {
+    // eslint-disable-next-line no-alert
+    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!')
+  }
+})()