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rename to 6-optimize/7-gcc-closure-library/article.md
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diff --git a/3-more/5-frames-and-windows/1-window-open/article.md b/7-frames-and-windows/1-window-open/article.md
similarity index 100%
rename from 3-more/5-frames-and-windows/1-window-open/article.md
rename to 7-frames-and-windows/1-window-open/article.md
diff --git a/3-more/5-frames-and-windows/2-iframes/article.md b/7-frames-and-windows/2-iframes/article.md
similarity index 91%
rename from 3-more/5-frames-and-windows/2-iframes/article.md
rename to 7-frames-and-windows/2-iframes/article.md
index 4f41e08b..757c55a2 100644
--- a/3-more/5-frames-and-windows/2-iframes/article.md
+++ b/7-frames-and-windows/2-iframes/article.md
@@ -30,9 +30,7 @@
 [smart header="src='javascript:...'"]
 Атрибут `src` может использовать протокол `javascript:...`. При этом код выполняется и его результат будет содержимым ифрейма. Этот способ описан в стандарте и поддерживается всеми браузерами.
 
-Атрибут `src` является обязательным, и его отсутствие может привести к проблемам, вплоть до игнорирования ифрейма браузером. 
-
-Чтобы ничего не загружать в ифрейм, можно указать `src="javascript:''"`.
+Атрибут `src` является обязательным, и его отсутствие может привести к проблемам, вплоть до игнорирования ифрейма браузером. Чтобы ничего не загружать в ифрейм, можно указать пустую строку: `src="javascript:''"`.
 [/smart]
 
 ## Кросс-доменность: ограничение доступа к окну
@@ -41,7 +39,7 @@
 
 Внешний документ имеет полный доступ к `<iframe>` как к DOM-узлу. А вот к окну -- если они с одного источника.
 
-Это приводит к забавным последствиям. Например, мы можем повесить обработчик `iframe.onload`, чтобы узнать о загрузке `<iframe>`, а вот на `iframe.contentWindow.onload` -- лишь в случае, если окно с того же источника.
+Это приводит к забавным последствиям. Например, чтобы узнать об окончании загрузки `<iframe>`, мы можем повесить обработчик `iframe.onload`. По сути, это то же самое что `iframe.contentWindow.onload`, но его мы можем поставить лишь в случае, если окно с того же источника.
 
 ```html
 <!--+ run height=120 -->
@@ -51,10 +49,14 @@
   var iframe = document.getElementsByTagName('iframe')[0];
 
   // сработает
-  iframe.onload = function() { alert("iframe onload"); }
+  iframe.onload = function() { 
+    alert("iframe onload"); 
+  };
 
   // не сработает
-  iframe.contentWindow.onload = function() { alert("contentWindow onload"); }
+  iframe.contentWindow.onload = function() { 
+    alert("contentWindow onload"); 
+  };
 </script>
 ```
 
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-# Учебник
+# Дополнительные темы