The getElementByTagName() method returns all the element.
<html>
<body>
<script type="text/javascript">
function mahi()
{
var prgf=document.getElementsByTagName("p");
alert("total p tags are: "+prgf.length);
}
</script>
<p>This is a pragraph</p>
<p>Here we are going to count total number of paragraphs by getElementByTagName() method.</p>
<p>Here is the simple example.</p>
<p>I am Mahi Babariya.</p>
<p>I Love My parents alot</p>
<button onclick="mahi()">Count Paragraph</button>
</body>
</html>
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