minor fixes

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

@@ -29,10 +29,15 @@ The exact look of developer tools depends on your version of Chrome. It changes
 - Here we can see the red-colored error message. In this case, the script contains an unknown "lalala" command.
 - On the right, there is a clickable link to the source `bug.html:12` with the line number where the error has occurred.
 
-Below the error message, there is a blue `>` symbol. It marks a "command line" where we can type JavaScript commands. Press `key:Enter` to run them (`key:Shift+Enter` to input multi-line commands).
+Below the error message, there is a blue `>` symbol. It marks a "command line" where we can type JavaScript commands. Press `key:Enter` to run them.
 
 Now we can see errors, and that's enough for a start. We'll come back to developer tools later and cover debugging more in-depth in the chapter <info:debugging-chrome>.
 
+```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`. This way one can enter long fragments of JavaScript code.
+```
 
 ## Firefox, Edge, and others
 
@@ -50,12 +55,6 @@ 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.
 
-```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`. This way one can enter long fragments of JavaScript code.
-```
-
 ## Summary
 
 - Developer tools allow us to see errors, run commands, examine variables, and much more.

1-js/05-data-types/11-date/8-format-date-relative/solution.md

@@ -62,6 +62,8 @@ function formatDate(date) {
   year = year.toString().slice(-2);
   month = month < 10 ? '0' + month : month;
   dayOfMonth = dayOfMonth < 10 ? '0' + dayOfMonth : dayOfMonth;
+  hour = hour < 10 ? '0' + hour : hour;
+  minutes = minutes < 10 ? '0' + minutes : minutes;
 
   if (diffSec < 1) {
     return 'right now';  

1-js/06-advanced-functions/09-call-apply-decorators/article.md

@@ -149,8 +149,8 @@ let user = { name: "John" };
 let admin = { name: "Admin" };
 
 // use call to pass different objects as "this"
-sayHi.call( user ); // this = John
+sayHi.call( user ); // John
-sayHi.call( admin ); // this = Admin
+sayHi.call( admin ); // Admin
 ```
 
 And here we use `call` to call `say` with the given context and phrase:

2-ui/2-events/03-event-delegation/4-behavior-tooltip/task.md

@@ -22,8 +22,10 @@ In this task we assume that all elements with `data-tooltip` have only text insi
 
 Details:
 
+- The distance between the element and the tooltip should be `5px`.
+- The tooltip should be centered relative to the element, if possible.
 - The tooltip should not cross window edges. Normally it should be above the element, but if the element is at the page top and there's no space for the tooltip, then below it.
-- The tooltip is given in the `data-tooltip` attribute. It can be arbitrary HTML.
+- The tooltip content is given in the `data-tooltip` attribute. It can be arbitrary HTML.
 
 You'll need two events here:
 - `mouseover` triggers when a pointer comes over an element.

5-network/11-websocket/article.md

@@ -119,9 +119,9 @@ For instance:
 
 - `Sec-WebSocket-Extensions: deflate-frame` means that the browser supports data compression. An extension is something related to transferring the data, functionality that extends WebSocket protocol. The header `Sec-WebSocket-Extensions` is sent automatically by the browser, with the list of all extenions it supports.
 
-- `Sec-WebSocket-Protocol: soap, wamp` means that we'd like to transfer not just any data, but the data in [SOAP](http://en.wikipedia.org/wiki/SOAP) or WAMP ("The WebSocket Application Messaging Protocol") protocols. WebSocket subprotocols are registered in the [IANA catalogue](http://www.iana.org/assignments/websocket/websocket.xml).
+- `Sec-WebSocket-Protocol: soap, wamp` means that we'd like to transfer not just any data, but the data in [SOAP](http://en.wikipedia.org/wiki/SOAP) or WAMP ("The WebSocket Application Messaging Protocol") protocols. WebSocket subprotocols are registered in the [IANA catalogue](http://www.iana.org/assignments/websocket/websocket.xml). So, this header describes data formats that we're going to use.
 
-    This optional header is set by us, to tell the server which subprotocols our code supports, using the second (optional) parameter of `new WebSocket`. That's the array of subprotocols, e.g. if we'd like to use SOAP or WAMP:
+    This optional header is set using the second parameter of `new WebSocket`. That's the array of subprotocols, e.g. if we'd like to use SOAP or WAMP:
 
     ```js
     let socket = new WebSocket("wss://javascript.info/chat", ["soap", "wamp"]);