CodePen

HTML

            
              <html>
  <body>
    <div id='img-holder'>
      <!-- lots of pseudo SO logos -->
      <img src='http://goo.gl/FX9H1p' />
      <img src='http://goo.gl/FX9H1p' />
      <img src='http://goo.gl/FX9H1p' />
      <img src='http://goo.gl/FX9H1p' />
      <img src='http://goo.gl/FX9H1p' />
      <br>
      <img src='http://goo.gl/FX9H1p' />
      <img src='http://goo.gl/FX9H1p' />
      <img src='http://goo.gl/FX9H1p' />
      <img src='http://goo.gl/FX9H1p' />
      <img src='http://goo.gl/FX9H1p' />
        <br>
      <!-- these should not show -->
      <img src='http://goo.gl/FX9H1p' />
      <img src='http://goo.gl/FX9H1p' />
      <img src='http://goo.gl/FX9H1p' />
      <img src='http://goo.gl/FX9H1p' />
      
    </div>
  </body>
</html>
            
          
!

↑ Insert the most common viewport meta tag

CSS

            
              #img-holder > img:nth-of-type(n+11) {
  display: none;
}
            
          
!
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Must be a valid URL.
+ add another resource
via CSS Lint

JS

            
              
            
          
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