diff --git a/switch/lib/_switch-theme.scss b/switch/lib/_switch-theme.scss
index 2631c89ff8..7fec77cafd 100644
--- a/switch/lib/_switch-theme.scss
+++ b/switch/lib/_switch-theme.scss
@@ -114,7 +114,23 @@ $_forced-colors-theme: (
   @return $theme;
 }
 
+@function _warn-of-not-implemented($theme) {
+  // TODO(b/230484095): remove this warning once these are implemented.
+  @if (
+    map.has-key($theme, selected-handle-height) or
+      map.has-key($theme, selected-handle-width) or
+      map.has-key($theme, unselected-handle-height) or
+      map.has-key($theme, unselected-handle-width) or
+      map.has-key($theme, pressed-handle-height) or
+      map.has-key($theme, pressed-handle-width)
+  ) {
+    @warn '`handle-height` and `handle-width` are not yet implemented. see b/230484095';
+  }
+  @return $theme;
+}
+
 @mixin theme($theme, $resolvers: resolvers.$material) {
+  $theme: _warn-of-not-implemented($theme);
   $theme: theme.validate-theme($light-theme, $theme);
   $theme: _resolve-theme($theme, $resolvers);
   $theme: theme.create-theme-vars($theme, switch);
@@ -123,6 +139,7 @@ $_forced-colors-theme: (
 }
 
 @mixin theme-styles($theme, $resolvers: resolvers.$material) {
+  $theme: _warn-of-not-implemented($theme);
   $theme: theme.validate-theme-styles($light-theme, $theme);
   $theme: _resolve-theme($theme, $resolvers);
   $theme: theme.create-theme-vars($theme, switch);