What is the difference between id and class in HTML?

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In HTML, both id and class are attributes used to identify and style elements, but they serve different purposes:

id Attribute

The id is a unique identifier for an element.
Each page should have only one element with a specific id (no duplicates).
It is used when you need to target a single, specific element.
In CSS, it is selected with a # symbol, e.g., #header { color: blue; }.
In JavaScript, elements can be accessed easily using document.getElementById("idName").
Best for unique components like header, footer, or a form input.

class Attribute

The class is used to group multiple elements with the same styling or behavior.
Many elements can share the same class, making it reusable.
In CSS, it is selected with a . symbol, e.g., .btn { background: green; }.
In JavaScript, classes can be accessed with document.getElementsByClassName("className").
Best for applying common styles to multiple elements like buttons, cards, or text sections.

Key Difference:

id = unique, one per page, highest specificity in CSS.
class = reusable, multiple elements, more flexible.

For example:


<p id="intro">This is unique text.</p>
<p class="highlight">This is styled text.</p>
<p class="highlight">This is another styled text.</p>

Here, id="intro" applies only to one element, while class="highlight" can be shared across multiple.

👉 Would you like me to also explain the specificity difference between id and class in CSS (which overrides which)?

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