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HTML

<div id="parent">
<div>How to make two div heights equal with css.How to make two div heights equal with css.</div>
<div>How to make two div heights equal with css. How to make two div heights equal with css. How to make two div heights equal with css. How to make two div heights equal with css. How to make two div heights equal with css.</div>
</div>

CSS

div{
    background: #F00;
    float: left;
    width: 50%;
}