title: Styling (blur) a SVG with class via CSS
body: <p>I am trying to style some Path/SVG-Elements with CSS. In particular I am trying to apply a blur to their borders. 
  Since the Elements are created from a library (leaflet.clustermarkers) I can not control the creation of the SVG/Path-elements themselves. The library offers to give the elements a "class" that I can use to select them via CSS.</p>
  
  <p>So the following works:</p>
  
  <pre><code>.poligonArea{  
  
    fill:black;
  
  }
  </code></pre>
  
  <p>but the following only works in firefox but neither in Chrome, nor in Safari:</p>
  
  <pre><code>.poligonArea{  
  
    fill:black;
    filter: blur(5px);
    -webkit-filter: blur(10px);
  }
  </code></pre>
  
  <p>Why doesn't it work in Chome/Safari? They should support the svg-filters, no?</p>