diff --git a/less/button-groups.less b/less/button-groups.less
index 7bd639aac4..62e53f373a 100644
--- a/less/button-groups.less
+++ b/less/button-groups.less
@@ -120,7 +120,7 @@
 .btn-group > .btn + .dropdown-toggle {
   padding-left: 8px;
   padding-right: 8px;
-  .box-shadow(~"inset 1px 0 0 rgba(255,255,255,.125), inset 0 1px 0 rgba(255,255,255,.2), 0 1px 2px rgba(0,0,0,.05)");
+  .box-shadow(inset 1px 0 0 rgba(255,255,255,.125), inset 0 1px 0 rgba(255,255,255,.2), 0 1px 2px rgba(0,0,0,.05));
   *padding-top: 5px;
   *padding-bottom: 5px;
 }
@@ -147,7 +147,7 @@
   // Remove the gradient and set the same inset shadow as the :active state
   .dropdown-toggle {
     background-image: none;
-    .box-shadow(~"inset 0 2px 4px rgba(0,0,0,.15), 0 1px 2px rgba(0,0,0,.05)");
+    .box-shadow(inset 0 2px 4px rgba(0,0,0,.15), 0 1px 2px rgba(0,0,0,.05));
   }
 
   // Keep the hover's background when dropdown is open
diff --git a/less/buttons.less b/less/buttons.less
index c80986ea7b..3fd1e95f5f 100644
--- a/less/buttons.less
+++ b/less/buttons.less
@@ -24,7 +24,7 @@
   border-bottom-color: darken(@btnBorder, 10%);
   .border-radius(4px);
   .ie7-restore-left-whitespace(); // Give IE7 some love
-  .box-shadow(~"inset 0 1px 0 rgba(255,255,255,.2), 0 1px 2px rgba(0,0,0,.05)");
+  .box-shadow(inset 0 1px 0 rgba(255,255,255,.2), 0 1px 2px rgba(0,0,0,.05));
 
   // Hover state
   &:hover {
@@ -51,7 +51,7 @@
     background-color: darken(@white, 15%) e("\9");
     background-image: none;
     outline: 0;
-    .box-shadow(~"inset 0 2px 4px rgba(0,0,0,.15), 0 1px 2px rgba(0,0,0,.05)");
+    .box-shadow(inset 0 2px 4px rgba(0,0,0,.15), 0 1px 2px rgba(0,0,0,.05));
   }
 
   // Disabled state
diff --git a/less/forms.less b/less/forms.less
index 17fbaf857b..b4b86f907d 100644
--- a/less/forms.less
+++ b/less/forms.less
@@ -126,7 +126,7 @@ input[type="color"],
     border-color: rgba(82,168,236,.8);
     outline: 0;
     outline: thin dotted \9; /* IE6-9 */
-    .box-shadow(~"inset 0 1px 1px rgba(0,0,0,.075), 0 0 8px rgba(82,168,236,.6)");
+    .box-shadow(inset 0 1px 1px rgba(0,0,0,.075), 0 0 8px rgba(82,168,236,.6));
   }
 }
 
diff --git a/less/mixins.less b/less/mixins.less
index 0aba0be63c..51ee3e3362 100644
--- a/less/mixins.less
+++ b/less/mixins.less
@@ -183,10 +183,7 @@
     .box-shadow(inset 0 1px 1px rgba(0,0,0,.075)); // Redeclare so transitions work
     &:focus {
       border-color: darken(@borderColor, 10%);
-      // Write out in full since the lighten() function isn't easily escaped
-      -webkit-box-shadow: inset 0 1px 1px rgba(0,0,0,.075), 0 0 6px lighten(@borderColor, 20%);
-         -moz-box-shadow: inset 0 1px 1px rgba(0,0,0,.075), 0 0 6px lighten(@borderColor, 20%);
-              box-shadow: inset 0 1px 1px rgba(0,0,0,.075), 0 0 6px lighten(@borderColor, 20%);
+      .box-shadow(inset 0 1px 1px rgba(0,0,0,.075), 0 0 6px lighten(@borderColor, 20%));
     }
   }
   // Give a small background color for input-prepend/-append
@@ -251,10 +248,11 @@
 }
 
 // Drop shadows
-.box-shadow(@shadow) {
-  -webkit-box-shadow: @shadow;
-     -moz-box-shadow: @shadow;
-          box-shadow: @shadow;
+.box-shadow(@shadowA, @shadowB:X, ...){
+  @props: ~`"@{arguments}".replace(/[\[\]]|\,\sX/g, '')`;
+  -webkit-box-shadow: @props;
+     -moz-box-shadow: @props;
+          box-shadow: @props;
 }
 
 // Transitions
diff --git a/less/navbar.less b/less/navbar.less
index 64e2eb7ea3..3514c40e0f 100644
--- a/less/navbar.less
+++ b/less/navbar.less
@@ -202,7 +202,7 @@
 .navbar-fixed-top,
 .navbar-static-top {
   .navbar-inner {
-    .box-shadow(~"inset 0 -1px 0 rgba(0,0,0,.1), 0 1px 10px rgba(0,0,0,.1)");
+    .box-shadow(inset 0 -1px 0 rgba(0,0,0,.1), 0 1px 10px rgba(0,0,0,.1));
   }
 }
 
@@ -210,7 +210,7 @@
 .navbar-fixed-bottom {
   bottom: 0;
   .navbar-inner {
-    .box-shadow(~"inset 0 1px 0 rgba(0,0,0,.1), 0 -1px 10px rgba(0,0,0,.1)");
+    .box-shadow(inset 0 1px 0 rgba(0,0,0,.1), 0 -1px 10px rgba(0,0,0,.1));
   }
 }
 
@@ -262,9 +262,7 @@
   color: @navbarLinkColorActive;
   text-decoration: none;
   background-color: @navbarLinkBackgroundActive;
-  -webkit-box-shadow: inset 0 3px 8px rgba(0,0,0,.125);
-     -moz-box-shadow: inset 0 3px 8px rgba(0,0,0,.125);
-          box-shadow: inset 0 3px 8px rgba(0,0,0,.125);
+  .box-shadow(inset 0 3px 8px rgba(0,0,0,.125));
 }
 
 // Navbar button for toggling navbar items in responsive layouts
@@ -276,7 +274,7 @@
   margin-left: 5px;
   margin-right: 5px;
   .buttonBackground(darken(@navbarBackgroundHighlight, 5%), darken(@navbarBackground, 5%));
-  .box-shadow(~"inset 0 1px 0 rgba(255,255,255,.1), 0 1px 0 rgba(255,255,255,.075)");
+  .box-shadow(inset 0 1px 0 rgba(255,255,255,.1), 0 1px 0 rgba(255,255,255,.075));
 }
 .navbar .btn-navbar .icon-bar {
   display: block;
@@ -448,7 +446,7 @@
       color: @white;
       background-color: @navbarInverseSearchBackground;
       border-color: @navbarInverseSearchBorder;
-      .box-shadow(~"inset 0 1px 2px rgba(0,0,0,.1), 0 1px 0 rgba(255,255,255,.15)");
+      .box-shadow(inset 0 1px 2px rgba(0,0,0,.1), 0 1px 0 rgba(255,255,255,.15));
       .transition(none);
       .placeholder(@navbarInverseSearchPlaceholderColor);
 
diff --git a/less/progress-bars.less b/less/progress-bars.less
index 36744d89c7..0486371aa8 100644
--- a/less/progress-bars.less
+++ b/less/progress-bars.less
@@ -66,7 +66,7 @@
   .transition(width .6s ease);
 }
 .progress .bar + .bar {
-  .box-shadow(~"inset 1px 0 0 rgba(0,0,0,.15), inset 0 -1px 0 rgba(0,0,0,.15)");
+  .box-shadow(inset 1px 0 0 rgba(0,0,0,.15), inset 0 -1px 0 rgba(0,0,0,.15));
 }
 
 // Striped bars
diff --git a/less/responsive-navbar.less b/less/responsive-navbar.less
index 4ffa5a9fec..c454dd5e39 100644
--- a/less/responsive-navbar.less
+++ b/less/responsive-navbar.less
@@ -129,7 +129,7 @@
     margin: (@baseLineHeight / 2) 0;
     border-top: 1px solid @navbarBackground;
     border-bottom: 1px solid @navbarBackground;
-    .box-shadow(~"inset 0 1px 0 rgba(255,255,255,.1), 0 1px 0 rgba(255,255,255,.1)");
+    .box-shadow(inset 0 1px 0 rgba(255,255,255,.1), 0 1px 0 rgba(255,255,255,.1));
   }
   .navbar-inverse .nav-collapse .navbar-form,
   .navbar-inverse .nav-collapse .navbar-search {
diff --git a/less/scaffolding.less b/less/scaffolding.less
index 342dcf7051..4c735ba88c 100644
--- a/less/scaffolding.less
+++ b/less/scaffolding.less
@@ -41,9 +41,7 @@ a:hover {
   background-color: #fff;
   border: 1px solid #ccc;
   border: 1px solid rgba(0,0,0,.2);
-  -webkit-box-shadow: 0 1px 3px rgba(0,0,0,.1);
-     -moz-box-shadow: 0 1px 3px rgba(0,0,0,.1);
-          box-shadow: 0 1px 3px rgba(0,0,0,.1);
+  .box-shadow(0 1px 3px rgba(0,0,0,.1));
 }
 
 .img-circle {