Merge pull request #12378 from rickcurran/develop

FIX difference in behaviour between mouse & keyboard interactions on Sliders

Author: joeworkman

js/foundation.slider.js

@@ -521,7 +521,7 @@ class Slider extends Plugin {
     $handle.off('keydown.zf.slider').on('keydown.zf.slider', function(e) {
       var _$handle = $(this),
           idx = _this.options.doubleSided ? _this.handles.index(_$handle) : 0,
-          oldValue = parseFloat(_this.inputs.eq(idx).val()),
+          oldValue = parseFloat($handle.attr('aria-valuenow')),
           newValue;
 
       // handle keyboard event with keyboard util