Modernizr tests for IE10 & IE11, since they removed conditional comments (and still haven't gotten browsers quite right)

ie10plus.modernizr.js

// IE10
Modernizr.addTest('ie10', function() {
  // http://stackoverflow.com/questions/9900311/how-do-i-target-only-internet-explorer-10-for-certain-situations-like-internet-e
  'use strict';
  var match = (/*@cc_on!@*/false && document.documentMode === 10);
  return match;
});


// IE11
Modernizr.addTest('ie11', function() {
  // https://en.wikipedia.org/wiki/Internet_Explorer_11
  'use strict';
  // var ua = navigator.userAgent;
  // var match = /Trident.*rv[\s:]11\./i.test(ua);
  // ('msTransform' in document.body.style)
  var match = (!!document.documentMode &&
                !document.all &&
                (!!window.matchMedia || !!window.msMatchMedia) &&
                !Modernizr.websqldatabase &&
                !Modernizr.cssreflections);
  return match;
});

These are not pretty, but they do work. Seems to also work (as in detects false) in the various document modes.

Works for IE11 but not IE10 for me.

The following addition to the IE11 check will prevent it from including Microsoft Edge browser.

return match && (window.navigator.userAgent.indexOf('Edge/') == -1)

It may be cleaner to check for features, but meanwhile, this works.