So I found my own solution to this problem in the end.
After searching through Microsoft documentation I managed to find a new IE11 only style msTextCombineHorizontal
In my test, I check for IE10 styles and if they are a positive match, then I check for the IE11 only style. If I find it, then it's IE11+, if I don't, then it's IE10.
Code Example: Detect IE10 and IE11 by CSS Capability Testing (JSFiddle)
/**
Target IE 10 with JavaScript and CSS property detection.
# 2013 by Tim Pietrusky
# timpietrusky.com
**/
// IE 10 only CSS properties
var ie10Styles = [
'msTouchAction',
'msWrapFlow',
'msWrapMargin',
'msWrapThrough',
'msOverflowStyle',
'msScrollChaining',
'msScrollLimit',
'msScrollLimitXMin',
'msScrollLimitYMin',
'msScrollLimitXMax',
'msScrollLimitYMax',
'msScrollRails',
'msScrollSnapPointsX',
'msScrollSnapPointsY',
'msScrollSnapType',
'msScrollSnapX',
'msScrollSnapY',
'msScrollTranslation',
'msFlexbox',
'msFlex',
'msFlexOrder'];
var ie11Styles = [
'msTextCombineHorizontal'];
/*
* Test all IE only CSS properties
*/
var d = document;
var b = d.body;
var s = b.style;
var ieVersion = null;
var property;
// Test IE10 properties
for (var i = 0; i < ie10Styles.length; i++) {
property = ie10Styles[i];
if (s[property] != undefined) {
ieVersion = "ie10";
createEl("IE10 style found: " + property);
}
}
// Test IE11 properties
for (var i = 0; i < ie11Styles.length; i++) {
property = ie11Styles[i];
if (s[property] != undefined) {
ieVersion = "ie11";
createEl("IE11 style found: " + property);
}
}
if (ieVersion) {
b.className = ieVersion;
$('#versionId').html('Version: ' + ieVersion);
} else {
createEl('Not IE10 or 11.');
}
/*
* Just a little helper to create a DOM element
*/
function createEl(content) {
el = d.createElement('div');
el.innerHTML = content;
b.appendChild(el);
}
/*
* List of IE CSS stuff:
* http://msdn.microsoft.com/en-us/library/ie/hh869403(v=vs.85).aspx
*/
body {
font: 1.25em sans-serif;
}
div {
background: red;
color:#fff;
padding: 1em;
}
.ie10 div {
background: green;
margin-bottom:.5em;
}
.ie11 div {
background: purple;
margin-bottom:.5em;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<h1>Detect IE10 and IE11 by CSS Capability Testing</h1>
<h2 id="versionId"></h2>
I will update the code example with more styles when I discover them.
NOTE: This will almost certainly identify IE12 and IE13 as "IE11", as those styles will probably carry forward. I will add further tests as new versions roll out, and hopefully be able to rely again on Modernizr.
I'm using this test for fallback behavior. The fallback behavior is just less glamorous styling, it doesn't have reduced functionality.