jQuery Selector :first-of-type compare with :first and :first-child

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jQuery Selector :first-of-type compare with :first and :first-child

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<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
<script>
$(document).ready(function(){
  $("button").click(function(){
    var btn = $(this).text();/*from   w w w. jav a 2s.  c o  m*/
    $("p").css("background-color", "white");
    $("p" + btn).css("background-color", "yellow");
  });
});
</script>
</head>
<body>

<p>The first paragraph in body, and the first child in div.</p>

<div style="border:1px solid;">
  <p>The first paragraph in div, and the first child in div.</p>
  <p>The last paragraph in div, and the last child in div.</p>
</div><br>

<div style="border:1px solid;">
  <span>This is a span element, and the first child in this div.</span>
  <p>The first paragraph in another div, and the second child in this div.</p>
  <p>The last paragraph in another div, and the third child in this div.</p>
  <span>This is a span element, and the last child in this div.</span>
</div><br>

<div style="border:1px solid">
  <p>The first paragraph in another div, and the first child in this div.</p>
  <p>The last paragraph in the another div, and the last child in this div.</p>
</div>

<p>The last paragraph in body, and the last child in div.</p>

<button>:first</button>
<button>:first-child</button>
<button>:first-of-type</button><br><br>

</body>
</html>



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