Merge pull request #1 from javascript-tutorial/master

sync to upstream

.gitattributes

@@ -1 +1,2 @@
 * text=auto eol=lf
+*.svg       binary

1-js/01-getting-started/1-intro/article.md

@@ -75,7 +75,7 @@ Examples of such restrictions include:
     This limitation is, again, for the user's safety. A page from `http://anysite.com` which a user has opened must not be able to access another browser tab with the URL `http://gmail.com` and steal information from there.
 - JavaScript can easily communicate over the net to the server where the current page came from. But its ability to receive data from other sites/domains is crippled. Though possible, it requires explicit agreement (expressed in HTTP headers) from the remote side. Once again, that's a safety limitation.
 
-![](limitations.png)
+![](limitations.svg)
 
 Such limits do not exist if JavaScript is used outside of the browser, for example on a server. Modern browsers also allow plugin/extensions which may ask for extended permissions.
 
@@ -92,8 +92,7 @@ JavaScript is the only browser technology that combines these three things.
 
 That's what makes JavaScript unique. That's why it's the most widespread tool for creating browser interfaces.
 
-While planning to learn a new technology, it's beneficial to check its perspectives. So let's move on to the modern trends affecting it,  including new languages and browser abilities.
-
+That said, JavaScript also allows to create servers, mobile applications, etc.
 
 ## Languages "over" JavaScript
 

1-js/01-getting-started/2-manuals-specifications/article.md

@@ -3,16 +3,15 @@
 
 This book is a *tutorial*. It aims to help you gradually learn the language. But once you're familiar with the basics, you'll need other sources.
 
-
 ## Specification
 
-**The ECMA-262 specification** contains the most in-depth, detailed and formalized information about JavaScript. It defines the language.
+[The ECMA-262 specification](https://www.ecma-international.org/publications/standards/Ecma-262.htm) contains the most in-depth, detailed and formalized information about JavaScript. It defines the language.
 
-But being that formalized, it's difficult to understand at first. So if you need the most trustworthy source of information about the language details, it's the right place. But it's not for everyday use.
+But being that formalized, it's difficult to understand at first. So if you need the most trustworthy source of information about the language details, the specification is the right place. But it's not for everyday use.
 
 The latest draft is at <https://tc39.es/ecma262/>.
 
-To read about bleeding-edge features, that are not yet widely supported, see proposals at <https://github.com/tc39/proposals>.
+To read about new bleeding-edge features, including those that are "almost standard" (so-called "stage 3"), see proposals at <https://github.com/tc39/proposals>.
 
 Also, if you're in developing for the browser, then there are other specs covered in the [second part](info:browser-environment) of the tutorial.
 
@@ -25,11 +24,11 @@ Also, if you're in developing for the browser, then there are other specs covere
     Although, it's often best to use an internet search instead. Just use "MDN [term]" in the query, e.g. <https://google.com/search?q=MDN+parseInt> to search for `parseInt` function.
 
 
-- **MSDN** – Microsoft manual with a lot of information, including JavaScript (often referrerd to as JScript). If one needs something specific to Internet Explorer, better go there: <http://msdn.microsoft.com/>.
+- **MSDN** – Microsoft manual with a lot of information, including JavaScript (often referred to as JScript). If one needs something specific to Internet Explorer, better go there: <http://msdn.microsoft.com/>.
 
     Also, we can use an internet search with phrases such as "RegExp MSDN" or "RegExp MSDN jscript".
 
-## Feature support
+## Compatibility tables
 
 JavaScript is a developing language, new features get added regularly.
 

1-js/01-getting-started/4-devtools/article.md

@@ -50,11 +50,11 @@ Open Preferences and go to the "Advanced" pane. There's a checkbox at the bottom
 
 Now `key:Cmd+Opt+C` can toggle the console. Also, note that the new top menu item named "Develop" has appeared. It has many commands and options.
 
-## Multi-line input
-
+```smart header="Multi-line input"
 Usually, when we put a line of code into the console, and then press `key:Enter`, it executes.
 
-To insert multiple lines, press `key:Shift+Enter`.
+To insert multiple lines, press `key:Shift+Enter`. This way one can enter long fragments of JavaScript code.
+```
 
 ## Summary