javascript - How do I select the first child of a parent element? -

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I am trying to choose the first child of a basic element with pure javascript and changing its CSS properties I am I've tried the .firstChild and .childNodes [1] methods but they do not work on this CSS nth-child () selector's But I want to do it with Javascript for better browser support.

Example:

HTML 

  & lt; Div class = "daddy" & gt; & Lt; Div class = "child" & gt; I want to choose this child and want to change this css property. & Lt; / Div & gt; & Lt; Div class = "hair" & gt; & Lt; / Div & gt; & Lt; Div class = "hair" & gt; & Lt; / Div & gt; & Lt; Div class = "hair" & gt; & Lt; / Div & gt; & Lt; / Div & gt;   
 papa '); Var d = x.firstChild; // and x.childNodes [1] d.style.width = "5em";   
  CSS   
  Father: nth-child (1) {width : 5em; }   
 Any help would be appreciated.   
 
 
 For better browsers, click  cross-browser  as  Using the first-child  selector, you can be asked to use  Pure CSS  and this  CSS 2.1 , please link this and the table below. View which shows browser support:  
 table first-child  
 So a snap with  css only :  
  
 
 
  .child: first-child {/ * CSS you want here - just focus on visualization and snippets: * / background color: red; White color; }   
  & lt; Div class = "daddy" & gt; & Lt; Div class = "child" & gt; I want to choose this child and want to change this css property. & Lt; / Div & gt; & Lt; Div class = "hair" & gt; Hair 2 & lt; / Div & gt; & Lt; Div class = "hair" & gt; Child 3 & lt; / Div & gt; & Lt; Div class = "hair" & gt; Hair 4 & lt; / Div & gt; & Lt; / Div & gt;      

 




  






























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