title: Is there a way to tell if a browser is active?
body: <p>On my site I have an important notification that prompts a native alert() in order to bring the site to the foreground if the window is not already focused. The problem is that on some browsers, if the user is in another desktop application (Photoshop, Microsoft Word, etc), it will not bring the browser on top of that application. In this case the alert is pretty much useless and I would like to omit it (since it blocks the other scripts on my page). </p>
  
  <p>Is there a way to tell that a browser is the active application on a device? Or is there a different, non-blocking way to bring a window to the foreground?</p>
  
  <p>Thanks!</p>
  
  <p>Clarifications:
  I already know how to check if a window is active within a browser, but I just don't know how to check if the browser application itself is active.
  Also, browsers I need to support are Chrome, Safari, Firefox, and IE >= 9</p>