CSS selector for no source image

I know this is weird, but how can I select all IMGs in a document that has no source (I'm talking about a CSS selector)

That is, I want to choose

<IMG>

      

        
        
        
      

    

but not

<IMG src="/my_file.png">

      

        
        
        
      

    

Answer

img:not([src]) {
   /* style here */
}