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HTML

              
                <!-- 

Replicating the deprecated jQuery property .selector in CoffeeScript  

Read more: http://dev.mikamai.com/post/89858338769/replicating-the-deprecated-jquery-property-selector-in

-->

<div class="heymama">Hey, mama!</div>

<div id="dood">Sup dude?</div>

<div class="multiple personality">I'm a badger.</div>

<aside class="selectors">
  <h4>Selectors:</h4>
</aside>
              
            
!

CSS

              
                // Nothing interesting here

div
  text-align: center
  padding: 30px
  margin: 20px 0
  background-color: #eee
  position: relative

  &:after
    content: ""
    position: absolute
    top: 10px
    left: 10px
    text-transform: uppercase
    font-size: .8em
    font-weight: bold
    color: darken(#eaeaea, 40%)
  
  &:nth-child(1)
    &:after
      content: "class"
    
  &:nth-child(2)
    &:after
      content: "id"
      
  &:nth-child(3)
    &:after
      content: "multiple classes"

.selectors
  width: 50%
  margin: 60px auto
  text-align: center
  background-color: transparent
              
            
!

JS

              
                getSelector = (el) ->
  firstClass = $(el).attr('class')?.split(' ')[0]
  elId       = $(el).attr('id')

  if (elId isnt undefined) then "##{elId}" else ".#{firstClass}"

    
# Code below is just for presentational purposes
$ ->
  $('div').each ->
    selector = getSelector(this)
    $('.selectors').append "<p>#{selector}</p>"
              
            
!
999px

Console