::First-child of the <body>, not of the div#t3, news to me. You can't have ::first-child of the div#t3, it is always of the <body> ?

::first-child {outline dotted lime;} didn't display ?

Philippe Wittenbergh wrote:
Le 26 sept. 2014 à 22:36, Crest Christopher<crestchristop...@gmail.com>  a 
écrit :

Hi, I've been understanding the pseudo-class elements, I like their functionality.  I 
have a question, here is an code 
example<http://jsfiddle.net/bpL490pn/embedded/result/>, which is the 
first-child ?

div#t3 is the first-child of body
p.rt is the first-child of div#t3

Very quick debug tip:
:first-child { outline: 1px dotted lime; }

And are there any tools that aid in helping you know what is the first child, 
decedent children for FireFox or Chrome, as a helper tool in the beginning ?

Developer tools for each browser ?

Spec ?
http://www.w3.org/TR/css3-selectors/#first-child-pseudo

MDN usually has decent explanation:
https://developer.mozilla.org/en-US/docs/Web/CSS/:first-child

Philippe
--
Philippe Wittenbergh
http://l-c-n.com/





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