HTML tutorials :- What are IDs and Classes ?

HTML tutorials :- What are IDs and Classes ?

Unleash Your Web Design Creativity by Exploring the Power of IDs and Classes in HTML and CSS!


4 min read

It's crucial to comprehend how to use HTML and CSS to organize and decorate your information while creating a website. IDs and classes are two of the most crucial tools in this process. We'll discuss what HTML IDs and classes are, how they differ from one another, and how to utilize them efficiently in your online applications in this blog article.

What are IDs and Classes in HTML?

IDs and classes are both attributes that can be added to HTML elements to help identify and style them. An ID is a unique identifier for a specific element, while a class is a reusable identifier that can be applied to multiple elements.

IDs are typically used to identify specific elements on a page, such as a header, footer, or navigation menu. Each ID must be unique within a single HTML document, so they should only be used for elements that are used once. IDs are denoted by the "id" attribute in HTML and are written as follows:

<div id= "Box1">
  <!-- content goes here -->

On the other hand, classes are used to put together various elements that have a common appearance or behaviour. For instance, you might want to use the same font type for all of your website's headlines. You may quickly style all of the headings at once by giving each one a class. The "class" property in HTML designates classes, which are expressed as follows:

<div class= "structure">
  <!-- content goes here -->

One thing to remember is that, unlike classes, we can only assign one ID to an element at a time. An element may belong to more than one class. An element will gain more properties the more classes we add to it.

In what ways do IDs and Classes differ?

The differences between IDs and classes are substantial. Here are some significant variations:

  1. Unique vs Reusable: IDs are unique identifiers that ought to only be used for components that occur once on a page, as was already explained. On the other side, classes may be used to combine several objects that have the same appearance or behaviour.

  2. Because IDs are more specialized than classes, any style applied to an ID will take precedence over any style applied to a class. This might be helpful if you want to override particular styles for a particular element.

  3. CSS selectors: You may use an element's ID or class to target it while applying the CSS style. Classes are indicated by the "." sign, whereas IDs are indicated by the "#" symbol. For instance:

#Box1 {
  background-color: red;

.structure {
  font-family: Arial;

How to effectively use IDs and Classes?

Keep these recommended practices in mind while utilizing IDs and classes in your HTML and CSS:

  • Use IDs sparingly: IDs should only be used for components that occur once on a page, as was previously stated. Overusing IDs might make it more challenging to maintain your code.

  • Group items together with classes: Classes are a useful tool for customizing several elements simultaneously. Utilize them to assemble pieces that have a similar appearance or behaviour.

  • Be specific: Make sure to give your IDs and class names that are specific and appropriately reflect their functions. In the long term, this will make your code more straightforward to understand and maintain.


To sum up, classes and IDs are two of the most crucial ideas in HTML and CSS. They make it simpler to generate uniform styles across several pages and allow us to apply styles to specific components on a web page.

While classes may be used more than once and are used to group components with similar styles, IDs are unique identifiers for items on a page and can only be used once per page.

Use IDs and classes wisely when developing your own HTML and CSS projects to keep your code well-structured and straightforward to update. You can make attractive, responsive web pages that look fantastic on all devices by employing them appropriately.

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