title: Window open (silent)
body: <p>would anyone know how to use JS window.open(...) but do it silently, i.e not actually open it so open check if it is able to be opened?</p>
  
  <p>I am having to run script for a popup block check and I am almost there.  I don't want to browser to physically open the window, only to see if it can, and have no interference with the parent - no flicker, window.open then window.close, etc.</p>
  
  <p>so something like:</p>
  
  <pre><code>if (!window.open(...)) {
      // code to say your have popup blocked
  } else {
      ...
  }
  </code></pre>
  
  <p>Its the last piece of my jigsaw but just cannot find the right bit of code to fit in the space!</p>
  
  <p>Thanks</p>