CodePen

HTML

            
              <ul>

</ul>  
            
          
!

↑ Insert the most common viewport meta tag

CSS

            
              
            
          
!
? ?
? ?
Must be a valid URL.
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JS

            
              if( !$("ul").has("li").length ) {
	  $("ul").html("Sorry, this is empty");
}
            
          
!
Must be a valid URL.
+ add another resource
via JS Hint
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