:nth-child()
    The :nth-child() and :nth-last-child() CSS functional pseudo-classes match elements based on their index within a list of elements. The :first-child and :last-child pseudo-classes match the first and last element in a list, and the :only-child pseudo-class matches an element with no siblings.
  
Status
  
    
    
    Baseline Widely Available (since 2018-01-29)
  
    
    
  MDN documentation
Specifications
Browser support
- Chrome 1 Released on 2008-12-11
 - Chrome Android 18 Released on 2012-06-27
 - Edge 12 Released on 2015-07-29
 - Firefox 3.5 Released on 2009-06-30
 - Firefox for Android 4 Released on 2011-03-29
 - Safari 3.1 Released on 2008-03-18
 - Safari on iOS 2 Released on 2008-07-11
 
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