diff --git a/sass/base/skeleton.scss b/sass/base/skeleton.scss
index 3a3dcab047..40e4fd5de4 100644
--- a/sass/base/skeleton.scss
+++ b/sass/base/skeleton.scss
@@ -65,7 +65,7 @@ input.#{iv.$class-prefix}is-skeleton,
 textarea.#{iv.$class-prefix}is-skeleton {
   resize: none;
 
-  @include mx.placeholder {
+  &::placeholder {
     color: transparent !important;
   }
 }
diff --git a/sass/form/shared.scss b/sass/form/shared.scss
index f28d55c83b..8b51c75428 100644
--- a/sass/form/shared.scss
+++ b/sass/form/shared.scss
@@ -121,7 +121,7 @@ $input-radius: cv.getVar("radius") !default;
     #{cv.getVar("input-color-l")}
   );
 
-  @include mx.placeholder {
+  &::placeholder {
     color: cv.getVar("input-placeholder-color");
   }
 
@@ -167,7 +167,7 @@ $input-radius: cv.getVar("radius") !default;
     box-shadow: none;
     color: cv.getVar("input-disabled-color");
 
-    @include mx.placeholder {
+    &::placeholder {
       color: cv.getVar("input-disabled-placeholder-color");
     }
   }
diff --git a/sass/utilities/mixins.scss b/sass/utilities/mixins.scss
index 9f80090257..9ab51ca5e0 100644
--- a/sass/utilities/mixins.scss
+++ b/sass/utilities/mixins.scss
@@ -222,16 +222,6 @@
   -webkit-overflow-scrolling: touch;
 }
 
-@mixin placeholder {
-  $placeholders: ":-moz" ":-webkit-input" "-moz" "-ms-input";
-
-  @each $placeholder in $placeholders {
-    &:#{$placeholder}-placeholder {
-      @content;
-    }
-  }
-}
-
 @mixin reset {
   appearance: none;
   background: none;
@@ -245,16 +235,10 @@
 
 @mixin selection($current-selector: false) {
   @if $current-selector {
-    &::-moz-selection {
-      @content;
-    }
     &::selection {
       @content;
     }
   } @else {
-    ::-moz-selection {
-      @content;
-    }
     ::selection {
       @content;
     }
@@ -432,9 +416,6 @@
 
 @mixin unselectable {
   -webkit-touch-callout: none;
-  -webkit-user-select: none;
-  -moz-user-select: none;
-  -ms-user-select: none;
   user-select: none;
 }