What is the difference between id and class in HTML/CSS?
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In HTML and CSS, id and class are attributes used to identify and style elements, but they serve different purposes and have different rules.
id
-
An
idis a unique identifier for a single HTML element. -
It should only be used once per page.
-
In CSS, it is targeted with a
#symbol, e.g.,#header { color: red; }. -
It's often used for JavaScript interaction and deep linking (e.g.,
#section1in a URL). -
Example:
<div id="main-content">...</div>
class
-
A
classis a reusable identifier that can be applied to multiple elements. -
In CSS, it is targeted with a
.symbol, e.g.,.button { background: blue; }. -
One element can have multiple classes separated by spaces.
-
It’s useful for styling groups of elements with the same look or behavior.
-
Example:
<div class="box primary">...</div>
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