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@@ -473,10 +473,12 @@ added: v0.1.27
 
 * {Object} The global namespace object.
 
-In browsers, the top-level scope is the global scope. This means that
-within the browser `var something` will define a new global variable. In
-Node.js this is different. The top-level scope is not the global scope;
-`var something` inside a Node.js module will be local to that module.
+In browsers, the top-level scope has traditionally been the global scope. This
+means that `var something` will define a new global variable, except within
+ECMAScript modules. In Node.js, this is different. The top-level scope is not
+the global scope; `var something` inside a Node.js module will be local to that
+module, regardless of whether it is a [CommonJS module][] or an
+[ECMAScript module][].
 
 ## Class `Headers`
 
@@ -868,6 +870,8 @@ added: v18.0.0
 
 A browser-compatible implementation of [`WritableStreamDefaultWriter`][].
 
+[CommonJS module]: modules.md
+[ECMAScript module]: esm.md
 [Web Crypto API]: webcrypto.md
 [`--experimental-global-customevent`]: cli.md#--experimental-global-customevent
 [`--experimental-global-webcrypto`]: cli.md#--experimental-global-webcrypto