Tryit Editor v1.7

Source Code:

Result:

<!DOCTYPE html>
<html>
<head>
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js">
</script>
<script>
$(document).ready(function () {
  $("p.intro").css("background-color", "yellow");
});
</script>
</head>
<body>

<h1>Welcome to My Homepage</h1>
<p class="intro">My name is Donald.</p>
<p>I live in Duckburg.</p>

<p class="intro">My name is Dolly.</p>
<p>I live in Duckburg.</p>

</body>
</html>

Edit the code above and click "Submit Code" to see the result.

W3Schools.com - Try it yourself

Source Code:	Result:
<!DOCTYPE html> <html> <head> <script src="//ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"> </script> <script> $(document).ready(function () { $("p.intro").css("background-color", "yellow"); }); </script> </head> <body> <h1>Welcome to My Homepage</h1> <p class="intro">My name is Donald.</p> <p>I live in Duckburg.</p> <p class="intro">My name is Dolly.</p> <p>I live in Duckburg.</p> </body> </html>
Edit the code above and click "Submit Code" to see the result.	W3Schools.com - Try it yourself