Answer to Question #3307 in AJAX | JavaScript | HTML | PHP for Aditya

Question

What is difference between ID and CLASS selector in css?

Answer 1

The id and class SelectorsIn addition to setting a style for a HTML element, CSS allows you to specify your own selectors called "id" and "class".

The id SelectorThe id selector is used to specify a style for a single, unique element.
The id selector uses the id attribute of the HTML element, and is defined
with a "#".
The style rule below will be applied to the element with id="para1":

Example:#para1
{
text-align:center;
color:red;
}
Do NOT start an ID name with a number! It will not work in Mozilla/Firefox.


The class SelectorThe class selector is used to specify a style for a group of elements.
Unlike the id selector, the class selector is most often used on several
elements.
This allows you to set a particular style for many HTML elements with the
same class.
The class selector uses the HTML class attribute, and is defined with a "."

In the example below, all HTML elements with class="center" will be
center-aligned:
Example.center {text-align:center;}

You can also specify that only specific HTML elements should be affected by a class.
In the example below, all p elements with class="center" will be center-aligned:
Examplep.center {text-align:center;}

Do NOT start a class name with a number! This is only supported in Internet Explorer.