javascript - Variable Number of Divs Equally Spaced Vertically in a Container Div -

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i looking this vertically instead of horizontally. have tried solution here want child divs equally space on entire height of container div - solution centers divs without expanding space in between them use entire height of container. willing use javascript, prefer html/css solution. i've looked briefly flexbox, scared off backwards compatibility issues.

some basic code:

<div id="parent">     <div id="1" class="child"></div>     <div id="2" class="child"></div>     <div id="3" class="child"></div> </div>

should render div1 @ extreme top of parent, div 2 @ extreme bottom of parent, , div3 centered in middle, , ideally add variable number of additional child divs , spacing automatically adjust.

any suggestions? should use flexbox , not worry supporting older browsers?

i have worked javascript. javascript code is

function cssfunction(){             var elem = document.getelementsbyclassname("child")             var len = elem.length;             for(var i=0;i<len;i++){                 elem[i].style.height =200/len;             }         }

and css 

div#parent{   max-height: 200px;   width : 500px;   padding : 0px;   margin : 0px;  }  .child{     border:2px solid #a1a1a1;     width : 93%;     margin : 5% 0%;     height : 100%;  }

and html is

<body onload="cssfunction()">     <div id="parent">         <div id="d1" class="child">vertical alignment</div>         <div id="d2" class="child">vertical alignment</div>         <div id="d3" class="child">vertical alignment</div>         <div id="d4" class="child">vertical alignment</div>         <div id="d5" class="child">vertical alignment</div>         <div id="d6" class="child">vertical alignment</div>         <div id="d7" class="child">vertical alignment</div>         <div id="d8" class="child">vertical alignment</div> </div>

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