HTML class Attribute
The HTML class attribute is used to specify a class
for an HTML element.
Multiple HTML elements can share the same class.
Using The class Attribute
The class attribute is often used
to point to a class name in a style sheet. It can also be used by a JavaScript
to access and manipulate elements with the specific class name.
In the following example we have three <div> elements
with a class attribute with the value of
"city". All of the three <div> elements
will be styled equally according to the .city style
definition in the head section:
Example
<!DOCTYPE html>
<html>
<head>
<style>
.fixhubdesign{
background-color: tomato;
color: white;
border: 2px solid black;
margin: 20px;
padding: 20px;
}
</style>
</head>
<body>
<div class="fixhubdesign">
<h2>FixHub</h2>
<p>
FixHub
Blog is the easy free tutorial platform where you get the essential knowledge
what you need to know these at job sector.</p>
</div>
<div class="fixhubdesign">
<h2>Heading</h2>
<p> Paragraphs.</p>
</div>
<div class="fixhubdesign">
<h2> Heading </h2>
<p> Paragraphs</p>
</div>
</body>
</html>
In the following example we have two <span> elements
with a class attribute with the value of "note".
Both <span> elements will be styled
equally according to the .note style definition
in the head section:
Example
<!DOCTYPE html>
<html>
<head>
<style>
.note {
font-size: 120%;
color: red;
}
</style>
</head>
<body>
<h1>My <span class="note">Important</span> Heading</h1>
<p>This
is some <span class="note">important</span> text.</p>
</body>
</html>
Tip: The class attribute
can be used on any HTML
element.
Note: The class name is case sensitive!
The Syntax For Class
To create a class; write a period (.) character, followed by a
class name. Then, define the CSS properties within curly braces {}:
Example
Create a class named "fixhub":
<!DOCTYPE html>
<html>
<head>
<style>
.fixhub {
background-color: tomato;
color: white;
padding: 10px;
}
</style>
</head>
<body>
<h2 class="fixhub">heading</h2>
<p>paragraphs.</p>
<h2 class="fixhub"> heading
</h2>
<p> paragraphs.</p>
<h2 class="fixhub"> heading
</h2>
<p> paragraphs.</p>
</body>
</html>
Multiple Classes
HTML elements can belong to more than one class.
To define multiple classes, separate the class names with a space,
e.g. <div class="fixhub">. The element will be styled according
to all the classes specified.
In the following example, the first <h2> element
belongs to both the city class and also to
the main class, and will get the CSS styles
from both of the classes:
Example
<h2 class="fixhub">Heading 1</h2>
<h2 class="fixhub"> Heading 2</h2>
<h2 class="fixhub"> Heading 3</h2>
Different Elements Can Share Same Class
Different HTML elements can point to the same class name.
In the following example, both <h2> and <p> point
to the "city" class and will share the same style:
Example
<h2 class="fixhub">Heading</h2>
<p class="fixhub">Paragraphs</p>
Use of The class Attribute in JavaScript
The class name can also be used by JavaScript to perform certain
tasks for specific elements.
JavaScript can access elements with a specific class name with
the getElementsByClassName() method:
Example
Click on a button to hide all elements with the class name "fixhub":
<script>
function myFunction() {
var x = document.getElementsByClassName("fixhub");
for (var i = 0; i < x.length; i++) {
x[i].style.display = "none";
}
}
</script>
Don't worry if you don't understand the code in the example above.
If want to learn more about JavaScript please other tutorial
provider, we are not expert on JavaScript.
Chapter Summary
- The
HTML
classattribute specifies one or more class names for an element - Classes
are used by CSS and JavaScript to select and access specific elements
- The
classattribute can be used on any HTML element - The
class name is case sensitive
- Different
HTML elements can point to the same class name
getElementsByClassName() method
