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Screen Orientation detection - JS 1.2

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While working on Mobile Web Application, We can identify orientation or apply device specific css by CSS media queries , but if you need to detect media queries from JavaScript for orientation change, you can observe and notify it with JavaScript to trigger any event or DOM manipulation:
The Key is matchMedia method, it is a part of View Module of CSSOM (CSS Object Model) still in draft mode. http://dev.w3.org/csswg/cssom/

Sources:
http://dev.w3.org/csswg/cssom-view/#the-mediaquerylist-interface
https://developer.mozilla.org/en-US/docs/DOM/window.matchMedia
http://davidwalsh.name/orientation-change

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Copy this code and paste it in your HTML 
  1. // If there are matches, we're in portrait
  2. if(mql.matches) {  
  3.   // Portrait orientation
  4. } else {  
  5.   // Landscape orientation
  6. }
  7.  
  8. // Add a media query change listener
  9. mql.addListener(function(m) {
  10.   if(m.matches) {
  11.     // Changed to portrait
  12.   }
  13.   else {
  14.     // Changed to landscape
  15.   }
  16. });

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