CSS Id and Class in Web Designing - The Logic Tutorial

CSS Id and Class in Web Designing

When it comes to styling elements on a webpage, CSS provides a powerful way to do so. Two key concepts in CSS are Ids and Classes, which allow you to target specific elements for styling purposes.

Id Selector

An Id selector is a unique identifier for an HTML element. It is specified using the id attribute in HTML and preceded by a hash symbol (#) in CSS. The Id selector is used to style a single, unique element on a webpage.

      <div id="uniqueId">
        Content here...
      </div>
    

To apply styles to the element with the Id "uniqueId" in CSS:

      #uniqueId {
        /* CSS styles here */
      }
    

Class Selector

A Class selector is used to apply styles to multiple elements that share the same class attribute. Classes allow you to apply the same styles to multiple elements without having to repeat the styles for each individual element.

      <div class="commonClass">
        Content here...
      </div>
      <div class="commonClass">
        More content...
      </div>
    

To apply styles to elements with the class "commonClass" in CSS:

      .commonClass {
        /* CSS styles here */
      }
    

Differences Between Id and Class

While both Ids and Classes are used for styling elements, there are some key differences between them:

• Uniqueness: An Id must be unique within the HTML document, while a Class can be applied to multiple elements.
• Specificity: Ids have higher specificity than Classes. This means that styles applied using an Id selector will override styles applied using a Class selector.
• Usage: Ids are typically used for unique elements that require specific styling, while Classes are used for applying common styles to multiple elements.

Best Practices

When using Ids and Classes in your CSS, it's important to follow some best practices:

• Use Classes for Reusability: Use Classes to apply styles to multiple elements that share similar styling.
• Avoid Inline Styles: While it's possible to apply styles directly to HTML elements using inline styles, it's generally considered bad practice. Instead, use external or internal CSS to keep your styles separate from your HTML markup.
• Keep Ids Unique: Ensure that each Id is unique within your HTML document to avoid conflicts and maintain clarity in your code.