Update "Popups and window methods" article

Author: odsantos

3-frames-and-windows/01-popup-windows/article.md

@@ -38,26 +38,6 @@ button.onclick = () => {
 
 This way users are somewhat protected from unwanted popups, but the functionality is not disabled totally.
 
-What if the popup opens from `onclick`, but after `setTimeout`? That's a bit tricky.
-
-Try this code:
-
-```js run
-// open after 3 seconds
-setTimeout(() => window.open('http://google.com'), 3000);
-```
-
-The popup opens in Chrome, but gets blocked in Firefox.
-
-...If we decrease the delay, the popup works in Firefox too:
-
-```js run
-// open after 1 seconds
-setTimeout(() => window.open('http://google.com'), 1000);
-```
-
-The difference is that Firefox treats a timeout of 2000ms or less are acceptable, but after it -- removes the "trust", assuming that now it's "outside of the user action". So the first one is blocked, and the second one is not.
-
 ## window.open
 
 The syntax to open a popup is: `window.open(url, name, params)`:
@@ -87,7 +67,7 @@ Settings for `params`:
 
 There is also a number of less supported browser-specific features, which are usually not used. Check <a href="https://developer.mozilla.org/en/DOM/window.open">window.open in MDN</a> for examples.
 
-## Example: a minimalistic window   
+## Example: a minimalistic window
 
 Let's open a window with minimal set of features, just to see which of them browser allows to disable:
 
@@ -120,7 +100,7 @@ Rules for omitted settings:
 
 ## Accessing popup from window
 
-The `open` call returns a reference to the new window. It can be used to manipulate it's properties, change location and even more.
+The `open` call returns a reference to the new window. It can be used to manipulate its properties, change location and even more.
 
 In this example, we generate popup content from JavaScript:
 
@@ -239,7 +219,7 @@ There's also `window.onscroll` event.
 
 Theoretically, there are `window.focus()` and `window.blur()` methods to focus/unfocus on a window. And there are also `focus/blur` events that allow to catch the moment when the visitor focuses on a window and switches elsewhere.
 
-Although, in practice they are severely limited, because in the past evil pages abused them. 
+Although, in practice they are severely limited, because in the past evil pages abused them.
 
 For instance, look at this code:
 
@@ -257,10 +237,10 @@ Still, there are some use cases when such calls do work and can be useful.
 
 For instance:
 
-- When we open a popup, it's might be a good idea to run a `newWindow.focus()` on it. Just in case, for some OS/browser combinations it ensures that the user is in the new window now.
+- When we open a popup, it might be a good idea to run `newWindow.focus()` on it. Just in case, for some OS/browser combinations it ensures that the user is in the new window now.
 - If we want to track when a visitor actually uses our web-app, we can track `window.onfocus/onblur`. That allows us to suspend/resume in-page activities, animations etc. But please note that the `blur` event means that the visitor switched out from the window, but they still may observe it. The window is in the background, but still may be visible.
 
-## Summary   
+## Summary
 
 Popup windows are used rarely, as there are alternatives: loading and displaying information in-page, or in iframe.