Difference between ID and Class in HTML5 and CSS3
HTML stands for Hypertext Markup and CSS stand for Cascading Style Sheet. Using this markup language, one can create complete responsive website templates. It is an essential language that is being used by many web designers to develop their site templates.
On the other hand, CSS is a styling language that works with the markup programming to love and beautify best theme.
While learning the HTML markup language and CSS styling sheet in site templates, most of the beginners got stuck between the ID and Class. This creates lots of uncertainty among the learner and they find it hard to learn.
This question is one of the top 5 questions those answers want to be answered by the most of the learners.
So, in order to make the concept clear, this article is written especially for the beginner web designers.
In this article, you will understand the role of both the elements.
So, let's get started to understand this concept in a better way.
Most Frequently Asked Question - What's the difference between Class and ID?
The first one and most regularly asked question is the difference between class and ID. It's a very simple question but for beginners it's critical that they understand the difference.
Answer to the question: So, basically we use IDs and classes to give HTML elements names so we can then select them in CSS in order to style them. So, to use an ID, we use the ID attribute in HTML and the Hash symbol (#) to select the element by ID in our CSS code just like you see in this example given below.
ID Example:
Id = "btn-primary"
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Adding style in the button by targeting the ID:
#btn-primary {
Color: orangered;
}
Now to use a class, we use the class element in HTML and select the element in CSS using the dot selector. See in the example given below.
Class Example:
Class = "btn-primary"
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Adding style in the button by targeting the Class:
.btn-primary {
Color: orangered;
}
Major Difference
Now but what's actually the difference between them?
Well, each ID can only exist once in the HTML document. In other words, I can say that IDs are unique. Technically you could actually give two elements the same ID but that would be invalid HTML. So that wouldn't really be perfect.
So, again you can use each ID name only once on your HTML document page.
Now, that has some serious implications for reusability like imagine you start using an ID for elements you think you gonna use once on your page but them later you actually want to reuse that element then you would you do?
You would have to go back and change everything from ID to class and that would be terrible.
So, in modern HTML and CSS development site templates we actually ever use the classes in website templates because that makes our code more usable and more portable. Using these selectors, you can make the code cleaner as well.
