1. Class Attribute We Can Create a Html File
<!DOCTYPE html>
<html>
<head>
<style>
.city {
background-color: tomato;
color: white;
border: 2px solid black;
margin: 20px;
padding: 20px;
}
</style>
</head>
<body>
<div class="city">
<h2>London</h2>
<p>London is the capital of England.</p>
</div>
<div class="city">
<h2>Paris</h2>
<p>Paris is the capital of France.</p>
</div>
<div class="city">
<h2>Tokyo</h2>
<p>Tokyo is the capital of Japan.</p>
</div>
</body>
</html>
<!DOCTYPE html> <html> <head> <style> .city { background-color: tomato; color: white; padding: 10px; } .main { text-align: center; } </style> </head> <body> <h2>Multiple Classes</h2> <p>Here, all three h2 elements belongs to the "city" class. In addition, London also belongs to the "main" class, which center-aligns the text.</p> <h2 class="city main">London</h2> <h2 class="city">Paris</h2> <h2 class="city">Tokyo</h2> </body> </html>
<!DOCTYPE html> <html> <head> <style> .city{ color:red; font-size: 30px; } h1{ color:blue; } button{ background-color: greenyellow; } </style> </head> <body> <h1>Use of The class Attribute in JavaScript</h1> <p>Click the button to hide all elements with class name "city":</p> <button onclick="myFunction()">Hide elements</button> <h2 class="city">London</h2> <p>London is the capital of England.</p> <h2 class="city">Paris</h2> <p>Paris is the capital of France.</p> <h2 class="city">Tokyo</h2> <p>Tokyo is the capital of Japan.</p> <script> function myFunction() { var x = document.getElementsByClassName("city"); for (var i = 0; i < x.length; i++) { x[i].style.display = "none"; } } </script> </body> </html>