What is the difference between id and class in CSS, and when should I use them? [duplicate]

by

  • Use a class when you want to consistently style multiple elements throughout the page/site. Classes are useful when you have, or possibly will have in the future, more than one element that shares the same style. An example may be a div of “comments” or a certain list style to use for related links.

    Additionally, a given element can have more than one class associated with it, while an element can only have one id. For example, you can give a div two classes whose styles will both take effect.

    Furthermore, note that classes are often used to define behavioral styles in addition to visual ones. For example, the jQuery form validator plugin heavily uses classes to define the validation behavior of elements (e.g. required or not, or defining the type of input format)

    Examples of class names are: tag, comment, toolbar-button, warning-message, or email.

  • Use the ID when you have a single element on the page that will take the style. Remember that IDs must be unique. In your case this may be the correct option, as there presumably will only be one “main” div on the page.

    Examples of ids are: main-content, header, footer, or left-sidebar.

A good way to remember this is a class is a type of item and the id is the unique name of an item on the page.

More Related Contents:

  1. How to align 3 divs (left/center/right) inside another div?
  2. Styling an input type=”file” button
  3. How to add images in select list?
  4. Using external images for CSS custom cursors
  5. CSS3’s border-radius property and border-collapse:collapse don’t mix. How can I use border-radius to create a collapsed table with rounded corners?
  6. Responsive Separator for Horizontal List
  7. What is use of ‘initial’ value in CSS?
  8. Media Queries for Different zoom Levels of Browser
  9. Use a normal link to submit a form
  10. Removing ul indentation with CSS
  11. HTML5 input type range show range value
  12. Jenkins – HTML Publisher Plugin – No CSS is displayed when report is viewed in Jenkins Server
  13. Creating a CSS3 box-shadow on all sides but one
  14. Remove border from IFrame
  15. Draw triangle in corner of div
  16. How to center content in a Bootstrap column?
  17. Why is a trailing punctuation mark rendered at the start with direction:rtl?
  18. How to prevent line break at hyphens in all browsers
  19. CSS object-fit: contain; is keeping original image width in layout
  20. Can I override inline !important?
  21. CSS property as SASS mixin value [duplicate]
  22. Preserve line breaks in textarea
  23. Why is there a default margin on the element? [closed]
  24. set css border to end in a 90 instead of a 45 degree angle
  25. extra space when centering elements using flexbox
  26. @Media print css
  27. Object-fit not affecting images
  28. centering a div between one that’s floated right and one that’s floated left
  29. How to select classes with spaces
  30. How to change style of radio and checkbox input [duplicate]

Leave a Comment