title: How unfocus on jQuery for is(':focus')
body: <p>Sorry for my poor English. 
  I'm using jQuery plugin <a href="http://kenwheeler.github.io/slick/#ed" rel="nofollow">slick</a>. It contain some code</p>
  
  <pre><code>_isSlideOnFocus =_.$slider.find('*').is(':focus');
  ...
  if(_isSlideOnFocus) {
      //some code that i don't want to execute
  }
  </code></pre>
  
  <p>Plugin gives ability to execute callback right before upper code will execute. So i can unfocus elements, but i don't know how.</p>
  
  <p>In browser console right before upper code  i try </p>
  
  <pre><code>_.$slider.find('*').blur();
  _.$slider.find('*').each(function() {$(this).blur()});
  _.$slider.find('*').trigger('blur');
  </code></pre>
  
  <p>but it don't work's.</p>
  
  <p>i try in console</p>
  
  <pre><code>_.$slider.find(':focus'); //empty jQuery object
  
  _.$slider.find('*').each(function() {
      console.log($(this).is(':focus')); //false for all elements
  });
  
  _.$slider.find('*').is(':focus') //but this one returns true
  </code></pre>
  
  <p>Even if I try</p>
  
  <pre><code>_.$slider.find('*').each(function() {
          if($(this).is(':focus')) {
              $(this).blur();
              console.log($(this).is(':focus'));
          }
   });
  </code></pre>
  
  <p>console logs true, so as I can see blur is not working for is(':blur')
  How can i blur all elements in $slider? Thank's for help</p>
  
  <p><a href="https://jsfiddle.net/846ptuew/" rel="nofollow">Here</a> the fiddle. My code in the end of js block. Subject plugin code is in the Slick.prototype.activateADA function in the end of plugin.</p>