_display.scss in bootstrap-4.0.0.alpha6

- old
+ new

@@ -1,13 +1,18 @@
 //
 // Display utilities
 //
 
-.d-block {
-  display: block !important;
-}
-.d-inline-block {
-  display: inline-block !important;
-}
-.d-inline {
-  display: inline !important;
+@each $breakpoint in map-keys($grid-breakpoints) {
+  @include media-breakpoint-up($breakpoint) {
+    $infix: breakpoint-infix($breakpoint, $grid-breakpoints);
+
+    .d#{$infix}-none         { display: none !important; }
+    .d#{$infix}-inline       { display: inline !important; }
+    .d#{$infix}-inline-block { display: inline-block !important; }
+    .d#{$infix}-block        { display: block !important; }
+    .d#{$infix}-table        { display: table !important; }
+    .d#{$infix}-table-cell   { display: table-cell !important; }
+    .d#{$infix}-flex         { display: flex !important; }
+    .d#{$infix}-inline-flex  { display: inline-flex !important; }
+  }
 }