fixes

1-js/09-classes/03-static-properties-methods/article.md

@@ -49,8 +49,8 @@ class Article {
 
 // usage
 let articles = [
-  new Article("Mind", new Date(2019, 1, 1)),
+  new Article("HTML", new Date(2019, 1, 1)),
-  new Article("Body", new Date(2019, 0, 1)),
+  new Article("CSS", new Date(2019, 0, 1)),
   new Article("JavaScript", new Date(2019, 11, 1))
 ];
 
@@ -58,7 +58,7 @@ let articles = [
 articles.sort(Article.compare);
 */!*
 
-alert( articles[0].title ); // Body
+alert( articles[0].title ); // CSS
 ```
 
 Here `Article.compare` stands "over" the articles, as a means to compare them. It's not a method of an article, but rather of the whole class.
@@ -171,7 +171,7 @@ rabbits[0].run(); // Black Rabbit runs with speed 5.
 
 Now we can call `Rabbit.compare` assuming that the inherited `Animal.compare` will be called.
 
-How does it work? Again, using prototypes. As you might have already guessed, extends also gives `Rabbit` the `[[Prototype]]` reference to `Animal`.
+How does it work? Again, using prototypes. As you might have already guessed, `extends` gives `Rabbit` the `[[Prototype]]` reference to `Animal`.
 
 
 ![](animal-rabbit-static.png)
@@ -187,10 +187,10 @@ class Rabbit extends Animal {}
 // for static properties and methods
 alert(Rabbit.__proto__ === Animal); // true
 
-// and the next step is Function.prototype
+// the next step up leads to Function.prototype
 alert(Animal.__proto__ === Function.prototype); // true
 
-// that's in addition to the "normal" prototype chain for object methods
+// the "normal" prototype chain for object methods
 alert(Rabbit.prototype.__proto__ === Animal.prototype);
 ```
 

1-js/13-modules/02-import-export/article.md

@@ -1,4 +1,3 @@
-
 # Export and Import
 
 Export and import directives are very versatile.

8-web-components/3-shadow-dom/article.md

@@ -98,7 +98,7 @@ alert(elem.shadowRoot.host === elem); // true
 
 Shadow DOM is strongly delimited from the main document:
 
-1. Shadow DOM elements are not visible to `querySelector` from the light DOM. In particular,  Shadow DOM elements may have ids that conflict with those in the light DOM. They be unique only within the shadow tree.
+1. Shadow DOM elements are not visible to `querySelector` from the light DOM. In particular,  Shadow DOM elements may have ids that conflict with those in the light DOM. They must be unique only within the shadow tree.
 2. Shadow DOM has own stylesheets. Style rules from the outer DOM don't get applied.
 
 For example:

9-regular-expressions/03-regexp-character-classes/article.md

@@ -263,7 +263,7 @@ Modern JavaScript allows to use these properties in regexps to look for characte
 
 - A cyrillic letter is: `pattern:\p{Script=Cyrillic}` or `pattern:\p{sc=Cyrillic}`.
 - A dash (be it a small hyphen `-` or a long dash `—`): `pattern:\p{Dash_Punctuation}` or `pattern:\p{pd}`.
-- A currency symbol: `pattern:\p{Currency_Symbol}` or `pattern:\p{sc}`.
+- A currency symbol, such as `$`, `€` or another: `pattern:\p{Currency_Symbol}` or `pattern:\p{sc}`.
 - ...And much more. Unicode has a lot of character categories that we can select from.
 
 These patterns require `'u'` regexp flag to work. More about that in the chapter [](info:regexp-unicode).