fixes #1041

1-js/02-first-steps/03-strict-mode/article.md

@@ -53,9 +53,17 @@ For the future, when you use a browser console to test features, please note tha
 
 Sometimes, when `use strict` makes a difference, you'll get incorrect results.
 
-Even if we press `key:Shift+Enter` to input multiple lines, and put `use strict` on top, it doesn't work. That's because of how the console executes the code internally.
+You can try to press `key:Shift+Enter` to input multiple lines, and put `use strict` on top, like this:
 
-The reliable way to ensure `use strict` would be to input the code into console like this:
+```js
+'use strict'; <Shift+Enter for a newline>
+//  ...your code
+<Enter to run>
+```
+
+It works in most browsers, namely Firefox and Chrome.
+
+If it doesn't, the most reliable way to ensure `use strict` would be to input the code into console like this:
 
 ```js
 (function() {

9-regular-expressions/10-regexp-backreferences/article.md

@@ -1,6 +1,6 @@
 # Backreferences in pattern: \n and \k
 
-Capturing groups can be accessed not only in the result or in the replacement string, but also in the pattern itself.
+We can use the contents of capturing groups `(...)` not only in the result or in the replacement string, but also in the pattern itself.
 
 ## Backreference by number: \n
 
@@ -12,7 +12,7 @@ We need to find a quoted string: either a single-quoted `subject:'...'` or a dou
 
 How to look for them?
 
-We can put two kinds of quotes in the pattern: `pattern:['"](.*?)['"]`, but it would find strings with mixed quotes, like `match:"...'` and `match:'..."`. That would lead to incorrect matches when one quote appears inside other ones, like the string `subject:"She's the one!"`:
+We can put both kinds of quotes in the square brackets: `pattern:['"](.*?)['"]`, but it would find strings with mixed quotes, like `match:"...'` and `match:'..."`. That would lead to incorrect matches when one quote appears inside other ones, like the string `subject:"She's the one!"`:
 
 ```js run
 let str = `He said: "She's the one!".`;
@@ -25,7 +25,7 @@ alert( str.match(reg) ); // "She'
 
 As we can see, the pattern found an opening quote `match:"`, then the text is consumed lazily till the other quote `match:'`, that closes the match.
 
-To make sure that the pattern looks for the closing quote exactly the same as the opening one, we can make a groups of it and use the backreference.
+To make sure that the pattern looks for the closing quote exactly the same as the opening one, we can wrap it into a capturing group and use the backreference.
 
 Here's the correct code: