Tryit Editor v2.7

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<!DOCTYPE html>
<html>
<head>
<style>
.descendants * { 
    display: block;
    border: 2px solid lightgrey;
    color: lightgrey;
    padding: 5px;
    margin: 15px;
}
</style>
<script src="https://ajax.googleapis.bootcss.com/ajax/libs/jquery/1.12.0/jquery.min.js"></script>
<script>
$(document).ready(function(){
    $("div").children().css({"color": "red", "border": "2px solid red"});
});
</script>

<script>
var _hmt = _hmt || [];
(function() {
var hm = document.createElement("script");
hm.src = "//hm.baidu.com/hm.js?73c27e26f610eb3c9f3feb0c75b03925";
var s = document.getElementsByTagName("script")[0];
s.parentNode.insertBefore(hm, s);
})();
</script>
</head>
<body>

<div class="descendants" style="width:500px;">div (current element) 
  <p>p (child)
    <span>span (grandchild)</span>     
  </p>
  <p>p (child)
    <span>span (grandchild)</span>
  </p> 
</div>

</body>
</html>