Aug 20, 2023
diff --git a/3-frames-and-windows/03-cross-window-communication/article.md b/3-frames-and-windows/03-cross-window-communication/article.md
 *!*
    let iframeWindow = iframe.contentWindow; // OK
 */!*
    try {
      // ...but not to the document inside it

    // ...but when we try to access the document

 *!*
 let doc = iframe.contentDocument; //ERROR
    let doc = iframe.contentDocument; //...we'll get null
 */!*
    } catch(e) {
      alert(e); // Security Error (another origin)
    }

    // also we can't READ the URL of the page in iframe
    try {
      //Can't read URL from the Location object
      //can't read URL from the Location object
 *!*
      let href = iframe.contentWindow.location.href; // ERROR
 */!*
 </script>
 ```

 The code above showserrors for any operations except:
 The code above shows`null` or error for any operations except:

 - Getting the reference to the inner window `iframe.contentWindow` - that's allowed.
 - Writing to `location`.
Original file line number	Diff line number	Diff line change
Expand Up		@@ -48,18 +48,16 @@ For instance, let's try reading and writing to `<iframe>` from another origin:
		!
		let iframeWindow = iframe.contentWindow; // OK
		/!
		try {
		// ...but not to the document inside it

		// ...but when we try to access the document

		!
		let doc = iframe.contentDocument; //ERROR
		let doc = iframe.contentDocument; //...we'll get null
		/!
		} catch(e) {
		alert(e); // Security Error (another origin)
		}

		// also we can't READ the URL of the page in iframe
		try {
		//Can't read URL from the Location object
		//can't read URL from the Location object
		!
		let href = iframe.contentWindow.location.href; // ERROR
		/!
Expand All		@@ -77,7 +75,7 @@ For instance, let's try reading and writing to `<iframe>` from another origin:
		</script>
		```

		The code above showserrors for any operations except:
		The code above shows`null` or error for any operations except:

		- Getting the reference to the inner window `iframe.contentWindow` - that's allowed.
		- Writing to `location`.
Expand Down