[747e744] | 1 | // NOTICE!! DO NOT USE ANY OF THIS JAVASCRIPT |
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| 2 | // IT'S JUST JUNK FOR OUR DOCS! |
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| 3 | // ++++++++++++++++++++++++++++++++++++++++++ |
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| 4 | /*! |
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| 5 | * Copyright 2014-2015 Twitter, Inc. |
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| 6 | * |
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| 7 | * Licensed under the Creative Commons Attribution 3.0 Unported License. For |
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| 8 | * details, see https://creativecommons.org/licenses/by/3.0/. |
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| 9 | */ |
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| 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. |
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| 11 | (function () { |
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| 12 | 'use strict'; |
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| 13 | |
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| 14 | function emulatedIEMajorVersion() { |
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| 15 | var groups = /MSIE ([0-9.]+)/.exec(window.navigator.userAgent) |
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| 16 | if (groups === null) { |
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| 17 | return null |
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| 18 | } |
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| 19 | var ieVersionNum = parseInt(groups[1], 10) |
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| 20 | var ieMajorVersion = Math.floor(ieVersionNum) |
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| 21 | return ieMajorVersion |
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| 22 | } |
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| 23 | |
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| 24 | function actualNonEmulatedIEMajorVersion() { |
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| 25 | // Detects the actual version of IE in use, even if it's in an older-IE emulation mode. |
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| 26 | // IE JavaScript conditional compilation docs: https://msdn.microsoft.com/library/121hztk3%28v=vs.94%29.aspx |
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| 27 | // @cc_on docs: https://msdn.microsoft.com/library/8ka90k2e%28v=vs.94%29.aspx |
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| 28 | var jscriptVersion = new Function('/*@cc_on return @_jscript_version; @*/')() // jshint ignore:line |
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| 29 | if (jscriptVersion === undefined) { |
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| 30 | return 11 // IE11+ not in emulation mode |
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| 31 | } |
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| 32 | if (jscriptVersion < 9) { |
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| 33 | return 8 // IE8 (or lower; haven't tested on IE<8) |
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| 34 | } |
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| 35 | return jscriptVersion // IE9 or IE10 in any mode, or IE11 in non-IE11 mode |
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| 36 | } |
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| 37 | |
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| 38 | var ua = window.navigator.userAgent |
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| 39 | if (ua.indexOf('Opera') > -1 || ua.indexOf('Presto') > -1) { |
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| 40 | return // Opera, which might pretend to be IE |
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| 41 | } |
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| 42 | var emulated = emulatedIEMajorVersion() |
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| 43 | if (emulated === null) { |
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| 44 | return // Not IE |
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| 45 | } |
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| 46 | var nonEmulated = actualNonEmulatedIEMajorVersion() |
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| 47 | |
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| 48 | if (emulated !== nonEmulated) { |
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| 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!') |
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| 50 | } |
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| 51 | })(); |
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