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<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.2/jquery.min.js"></script>
<script>
$(document).ready(function(){
    $("div span").css("background-color", "yellow");
});
</script>
</head>
<body>    

<h2>What will $("div span") select?</h2>

<h4>This div element has two descendants, p and span:</h4>
<div style="border:1px solid black;padding:10px;">
  <p>This is a paragraph.</p>
  <span>This is a text inside a span.</span>
</div>

<h4>This div element has also two descendants, p and span:</h4>
<div style="border:1px solid black;padding:10px;">
  <p>This is a paragraph. <span>This is a span element, inside the paragraph.</span></p>
</div>

</body>
</html>