anchor.diff:  === Understand Protected Mode
   [qanda]
   What's the defaul _Protect Mode_ setting::
  -IE will enable _Protect Mode_ for _Internet Zone_ and _Restricted sites Zone_ by default
  +IE will enable _Protect Mode_ for _Internet Zone_, _Local Intranet_ footnote:[Windows 10 IE11 NOT enable this Local Intranet Protect Mode by default] and _Restricted sites Zone_ by default
  +How to verify that Internet Explorer is running in Protected mode::
  +* look for the words "Protected Mode: On" next to the Web content zone displayed in Internet Explorer's status bar
  +* or right click page and choose _properties_, on the _properties_ tab, look for the words "Protected Mode: On"
   When `window.open()` will return `null`::
   There are 2 conditions:
   * Access from one security zone to another security zone, such as: _Local Intranet Zone_ => _Internet Zone_
  
positive.code: ____
  
  
  And now, this issue can be resolved as the evironment issue.
  
  
  == Learned More
  
negative.code: 
  == Troii Facebook can not connect
  
  http://www.activitycloud.com/target-marketer[Our product] allows customers to connect social media accounts for publishing messages, and use data insights to tell customers when people are most likely to interact with their messaging.
  
  Recently regression test, QA team reports an issue that can not connect Facebook on IE, but it works fine on Chrome and Firefox.
  
  We test the social media connect process on vitual machine with Window 10 + IE11, it can connect, but failed on QA'PC.
  
  After reviewing recent commits on our repo, there is no changes related to the connect social media process.
  
  