diff --git a/docs/web/custom-visualizations.md b/docs/web/custom-visualizations.md
index c4f1a940..00faa6a4 100644
--- a/docs/web/custom-visualizations.md
+++ b/docs/web/custom-visualizations.md
@@ -29,8 +29,8 @@ window.revealBridge = {
     }
 
     try {
-      if (window.top && window.top.location) {
-        window.top.postMessage(data, "*");
+      if (window.parent && window.parent.location) {
+        window.parent.postMessage(data, "*");
       }
     } catch (e) {
       // window.top.postMessage couldn't be executed.
diff --git a/i18n/ja/docusaurus-plugin-content-docs/current/web/custom-visualizations.md b/i18n/ja/docusaurus-plugin-content-docs/current/web/custom-visualizations.md
index d7157124..c1a73d80 100644
--- a/i18n/ja/docusaurus-plugin-content-docs/current/web/custom-visualizations.md
+++ b/i18n/ja/docusaurus-plugin-content-docs/current/web/custom-visualizations.md
@@ -29,8 +29,8 @@ window.revealBridge = {
     }
 
     try {
-      if (window.top && window.top.location) {
-        window.top.postMessage(data, "*");
+      if (window.parent && window.parent.location) {
+        window.parent.postMessage(data, "*");
       }
     } catch (e) {
       // window.top.postMessage couldn't be executed.