diff --git a/_javascript/modules/theme.js b/_javascript/modules/theme.js
index f9ebf2024..49e4e89bb 100644
--- a/_javascript/modules/theme.js
+++ b/_javascript/modules/theme.js
@@ -39,7 +39,10 @@ class Theme {
   }
 
   static get #mode() {
-    return sessionStorage.getItem(this.#modeKey);
+    return (
+      sessionStorage.getItem(this.#modeKey) ||
+      document.documentElement.getAttribute(this.#modeAttr)
+    );
   }
 
   static get #isDarkMode() {