From d4728b8c6dfb06b9e65d3ec31f8c7d3fe34b7c75 Mon Sep 17 00:00:00 2001
From: Chris Rebert <code@rebertia.com>
Date: Thu, 24 Apr 2014 15:27:42 -0700
Subject: [PATCH] add script to warn folks trying to test old IE using IE's
unreliable emulation modes
---
docs/assets/js/ie-emulation-modes-warning.js | 51 ++++++++++++++++++++
1 file changed, 51 insertions(+)
create mode 100644 docs/assets/js/ie-emulation-modes-warning.js
diff --git a/docs/assets/js/ie-emulation-modes-warning.js b/docs/assets/js/ie-emulation-modes-warning.js
new file mode 100644
index 0000000000..82a4cac348
--- /dev/null
+++ b/docs/assets/js/ie-emulation-modes-warning.js
@@ -0,0 +1,51 @@
+// 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!');
+ }
+})();
--
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