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what is difference between id and class in css ?
- Thread starter Elly
- Start date
charvinair
New member
ID's are unique:
Each element can have only one ID
Each page can have only one element with that ID
Classes are NOT unique:
You can use the same class on multiple elements.
You can use multiple classes on the same element.
Each element can have only one ID
Each page can have only one element with that ID
Classes are NOT unique:
You can use the same class on multiple elements.
You can use multiple classes on the same element.
Jessicahoney
New member
I'll explain in detail with a real life example.
Suppose you are a student in 8th class with Rule Number 1009 and your friensd rule numbers are 1006, 1007 etc.,
Here rule numbers are IDs, they are unique and one ID for one student but class is for all. We can have same class for another section students also.
Suppose you are a student in 8th class with Rule Number 1009 and your friensd rule numbers are 1006, 1007 etc.,
Here rule numbers are IDs, they are unique and one ID for one student but class is for all. We can have same class for another section students also.
thachhaicute2
New member
ID use one in your html pages but Class can be used several times
tuantuanhminh
New member
Dissimilar to the id selector, the class selector is regularly utilized on a few components. This permits you to set a specific style for some HTML components with the same class. The class selector utilizes the HTML class quality, and is characterized with a "." A basic approach to take a gander at it is that an id is one of a kind to stand out component
ID is unique and used only once while class is not unique and can be used multiple times
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banhuhoian
New member
Hello you
ID's are unique
Each element can have only one ID
Each page can have only one element with that ID
When I was first learning this stuff, I heard over and over that you should only use ID's once, but you can use classes over and over. It basically went in one ear and out the other because it sounded more like a good "rule of thumb" to me rather than something extremely important. If you are purely an HTML/CSS person, this attitude can persist because to you, they really don't seem to do anything different.
Here is one: your code will not pass validation if you use the same ID on more than one element. Validation should be important to all of us, so that alone is a big one. We'll go over more reasons for uniqueness as we go on.
#Classes are NOT unique
You can use the same class on multiple elements.
You can use multiple classes on the same element.
Any styling information that needs to be applied to multiple objects on a page should be done with a class. Take for example a page with multiple "widgets":
<div class="widget"></div>
<div class="widget"></div>
<div class="widget"></div>
You can now use the class name "widget" as your hook to apply the same set of styling to each one of these. But what if you need one of them to be bigger than the other, but still share all the other attributes? Classes has you covered there, as you can apply more than one class:
<div class="widget"></div>
<div class="widget big"></div>
<div class="widget"></div>
No need to make a brand new class name here, just apply a new class right in the class attribute. These classes are space delimited and most browsers support any number of them (actually, it's more like thousands, but way more than you'll ever need).
ID's are unique
Each element can have only one ID
Each page can have only one element with that ID
When I was first learning this stuff, I heard over and over that you should only use ID's once, but you can use classes over and over. It basically went in one ear and out the other because it sounded more like a good "rule of thumb" to me rather than something extremely important. If you are purely an HTML/CSS person, this attitude can persist because to you, they really don't seem to do anything different.
Here is one: your code will not pass validation if you use the same ID on more than one element. Validation should be important to all of us, so that alone is a big one. We'll go over more reasons for uniqueness as we go on.
#Classes are NOT unique
You can use the same class on multiple elements.
You can use multiple classes on the same element.
Any styling information that needs to be applied to multiple objects on a page should be done with a class. Take for example a page with multiple "widgets":
<div class="widget"></div>
<div class="widget"></div>
<div class="widget"></div>
You can now use the class name "widget" as your hook to apply the same set of styling to each one of these. But what if you need one of them to be bigger than the other, but still share all the other attributes? Classes has you covered there, as you can apply more than one class:
<div class="widget"></div>
<div class="widget big"></div>
<div class="widget"></div>
No need to make a brand new class name here, just apply a new class right in the class attribute. These classes are space delimited and most browsers support any number of them (actually, it's more like thousands, but way more than you'll ever need).
Martin smith
New member
id's are unique, each element have only one id and each page can have only one element with that id.
Classes are not unique, you can use same class on multiple elements..
Classes are not unique, you can use same class on multiple elements..
astrologerhome
New member
Thanks for replies.