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: ____
  
  == References
  . https://msdn.microsoft.com/en-us/library/bb250462(v=vs.85).aspx
  . https://msdn.microsoft.com/library/ms536651(v=vs.85).aspx.
  . https://blogs.msdn.microsoft.com/ieinternals/2012/06/05/the-intranet-zone/
  
  