Tryit Editor v2.9

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<!DOCTYPE html>
<html>
<body>

Hello World!

The DOM is very useful.
This example demonstrates the getElementsByTagName method



<script>
var x = document.getElementsByTagName("p");
document.getElementById("demo").innerHTML =
'The first paragraph (index 0) is: ' + x[0].innerHTML;
</script>

</body>
</html>

<!DOCTYPE html>
<html>
<body>

<p>Hello World!</p>

<p>The DOM is very useful.</p>
<p>This example demonstrates the <b>getElementsByTagName</b> method</p>

<p id="demo"></p>

<script>
var x = document.getElementsByTagName("p");
document.getElementById("demo").innerHTML = 
'The first paragraph (index 0) is: ' + x[0].innerHTML;
</script>

</body>
</html>