diff --git a/doc/api_assets/style.css b/doc/api_assets/style.css
index 4d51e7ab45779c..32e4a2686f7aca 100644
--- a/doc/api_assets/style.css
+++ b/doc/api_assets/style.css
@@ -837,4 +837,24 @@ kbd {
   #apicontent {
     overflow: hidden;
   }
+  .js-flavor-selector {
+    display: none;
+  }
+  .js-flavor-selector + * {
+    margin-bottom: 2rem;
+    padding-bottom: 2rem;
+    border-bottom: 1px solid var(--color-text-primary);
+  }
+  .js-flavor-selector ~ * {
+    display: block !important;
+    background-position: top right;
+    background-size: 142px 20px;
+    background-repeat: no-repeat;
+  }
+  .js-flavor-selector ~ .cjs {
+    background-image: url(./js-flavor-cjs.svg);
+  }
+  .js-flavor-selector ~ .esm {
+    background-image: url(./js-flavor-esm.svg);
+  }
 }