Which to use div class name or div id name

Question

I am learning HTML  Can someone please tell me what is the difference between class and id and when to use one over the other  They seem to do the same thing   lt  DOCTYPE HTML gt   lt html gt   lt head gt    lt style gt    mycolor1  color  red        mycolor2  color  red     lt  style gt    lt  head gt   lt body gt    lt div id  mycolor1  gt      hello world  lt  div gt   lt div class  mycolor2  gt      hello world  lt  div gt    lt  body gt   lt  html gt

User · Answer

To put it simnply  id is unique to just one element in the whole HTML document  but class can be added to numerous elements   Also  ID properties have priority over class properties   ids and classes are especially useful if you plan on using javascript or any of its frameworks

User · Answer

They do not do the same thing id is used to target a specific element  classname can be used to target multiple elements   Example    lt div id  mycolor1  class  mycolor2  gt      hello world  lt  div gt   lt div class  mycolor2  gt      hello world2  lt  div gt   lt div class  mycolor2  gt      hello world3  lt  div gt    Now  you can refer all the divs with classname mycolor2 at once using   mycolor2  color  red     for example - in css   This would set all nodes with class mycolor2 to red   However  if you want to set specifically mycolor1 to blue   you can target it specifically like this    mycolor1  color  blue

User · Answer

ID provides a unique indentifier for the element  in case you want to manipulate it in JavaScript    The class attribute can be used to treat a group of HTML elements the same  particularly in regards to fonts  colors and other style properties

User · Answer

Read the spec for the attributes and for CSS    id must be unique   class does not have to be id has higher  highest   specificity in CSS Elements can have multiple non-ordinal classes  separated by spaces   but only one id It is faster to select an element by it s ID when querying the DOM id can be used as an anchor target  using the fragment of the request  for any element   name only works with anchors   lt a gt

User · Answer

the Id selector is used when referring to a single unique element   The Class selector referrers a group of elements    For example  if you have a multiple buttons that look the same  you should use class  mybutton  to have consistent styling    In terms of performance    CSS selectors are matched from right to left   Therefore   myClass should be  faster  than  myID because it misses out testing   The performance speed is negligible for normally sized pages and you will probably never notice a difference so it s mostly just about convention    Here is more info on why css is browsers match css selectors from right to left

User · Answer

class is used when u want to set properties for a group of elements  but id can be set for only one element

User · Answer

Classes should be used when you have multiple similar elements   Ex  Many div s displaying song lyrics  you could assign them a class of lyrics since they are all similar   ID s must be unique  They are used to target specific elements  Ex  An input for a users email could have the ID txtEmail -- No other element should have this ID

User · Answer

ID is suitable for the elements which appears only once Like  Logo sidebar container  And Class is suitable for the elements which has same UI but they can be appear more than once  Like   feed in the  feeds Container

User · Answer

The object itself will not change  The main difference between these 2 keyword is the use    The ID is usually single in the page The class can have one or many occurences   In the CSS or Javascript files    The ID will be accessed by the character   The class will be accessed by the character

User · Answer

ID s must be unique  only be given to one element in the DOM at a time   whereas classes don t have to be  You ve already discovered the CSS   class and   ID prefixes  so that s pretty much it

[html] Which to use <div class="name"> or <div id="name">?

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