Actualización

app/Resources/public/assets/modernizr/feature-detects/css-subpixelfont.js

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+/*
+ * Test for SubPixel Font Rendering
+ * (to infer if GDI or DirectWrite is used on Windows)
+ * Authors: @derSchepp, @gerritvanaaken, @rodneyrehm, @yatil, @ryanseddon
+ * Web: https://github.com/gerritvanaaken/subpixeldetect
+ */
+Modernizr.addTest('subpixelfont', function() {
+    var bool,
+        styles = "#modernizr{position: absolute; top: -10em; visibility:hidden; font: normal 10px arial;}#subpixel{float: left; font-size: 33.3333%;}";
+    
+    // see https://github.com/Modernizr/Modernizr/blob/master/modernizr.js#L97
+    Modernizr.testStyles(styles, function(elem) {
+        var subpixel = elem.firstChild;
+
+        subpixel.innerHTML = 'This is a text written in Arial';
+
+        bool = window.getComputedStyle ?
+            window.getComputedStyle(subpixel, null).getPropertyValue("width") !== '44px'
+            : false;
+    }, 1, ['subpixel']);
+
+    return bool;
+});