Difference between Class and Id in HTML

In the world of web development, understanding the subtleties of HTML is vital. Two central attributes, class and ID, assume a crucial part in forming the construction and styling of a webpage. In this article, we dive into the initial segment of this investigation, zeroing in on the essence of classes in HTML.

HTML, or Hyper Text Markup Language, is the foundation of web development. It gives the design and system to content on the web. Classes and IDs are attributes used to characterize and style elements inside an HTML document.

Introduction to Classes in HTML

In the realm of web development, HTML is the fundamental language for organizing content. Among its many credits, classes stand apart as flexible devices for gathering and styling elements. We should embark on an excursion into the world of classes and unwind their importance in making coordinated and stylishly satisfying web pages.

Defining Classes in HTML

At its center, a class in HTML is a component for gathering elements that share normal qualities. The syntax is straightforward yet strong, including the utilization of the class property followed by the picked class name. This clear methodology permits developers to arrange and coordinate elements productively.

Code

Styling with Classes

The genuine force of classes shows some signs of life when combined with CSS. By assigning a class to an element, developers can apply reliable styling across various elements, encouraging a durable visual personality. Let's investigate reasonable instances of how classes smooth out the styling system and add to the viability of code.

Code

.highlight {
  background-color: yellow;
  color: black;
}

Improving Code Association

One vital advantage of involving classes lies in the separation of concerns among HTML and CSS. By defining styles in a different CSS record, developers maintain an unmistakable distinction between the design and display layers. This upgrades code association and works with versatility and particularity in web design.

Classes likewise work with the separation of concerns in web development.
By defining styles in a different CSS record and connecting it to the HTML document, you keep the construction and show particular.
This improves maintainability as well as takes into consideration a more secluded and versatile way to deal with web plans.

Presently, we should think about a down-to-earth example. Imagine you have a website with different headings of various levels. For this situation, the classes "main-heading" and "sub-heading" assist with maintaining a steady style for each degree of heading, advancing a firm and expert appearance. You can utilize classes to characterize a reliable style for all headings of a particular level:

Code

<h1 class = " main-heading " > Welcome to Our Website </h1>
<h2 class = " sub-heading " > Explore Our Services </h2>
<h2 class = " sub-heading " > Latest Updates </h2>

In synopsis, classes in HTML give a strong component to gathering and styling elements. They add to the maintainability and association of code, making it more straightforward for developers to make tastefully satisfying and predictable web pages.

Real-World Application: Styling Headings

Consider a website that highlights different headings of various levels to outline the common sense of classes. We'll dive into how classes can be utilized to maintain a predictable style for each degree of heading, guaranteeing a clean and proficient appearance.

As we finish the HTML classes, it becomes obvious that they act as the spine for steady styling and code association. Their capacity to group elements and smooth out styling processes contributes to the creation of outwardly engaging and very organized web pages.

Example:

Code

<!DOCTYPE html>
<html lang = " en " >
<head>
  <meta charset = " UTF-8 " >
  <meta name = " viewport " content = " width = device-width, initial-scale = 1.0 " >
  <style>
    /* CSS */
    .highlight {
      background-color: #ffc107; /* Yellow */
      color: #212529; /* Black */
      padding: 10px;
      border-radius: 5px;
    }

    .main-heading {
      font-size: 24px;
      color: #007bff; /* Blue */
    }

    .sub-heading {
      font-size: 18px;
      color: #6c757d; /* Gray */
    }
  </style>
  <title> Class Example </title>
</head>
<body>

  <!-- HTML -->
  <p class = " highlight " > JAVATPOINT  (This paragraph has a special highlight.)  </p>

  <h1 class = " main-heading " > Welcome to Our Website </h1>
  <h2 class = " sub-heading " > Explore Our Tech Articles & Services </h2>

</body>
</html>

Output:

Introduction to IDs in HTML

As we explore the perplexing scene of web development, another central participant arises-IDs. Rather than classes, IDs offer a unique method for identifying and targeting individual elements within an HTML document. In this portion, we'll reveal the unmistakable job that IDs play in molding the precision and uniqueness of web pages.

Assigning IDs

Dissimilar to classes, which are intended for gathering elements, IDs are tied in with singling out unambiguous elements. The syntax is comparative, including the use of the id trait followed by the remarkable identifier. Every ID should be remarkable within a document, providing a particular marker for exact styling or communication.

Code

Hierarchy of Styles: IDs and CSS

IDs consistently incorporate CSS styling, offering a progressive particularity that permits developers to apply explicit styles overriding common principles or styles applied through classes. This various leveled nature guarantees that the styling characterized for an ID outweighs everything else, providing tweaked command over individual elements.

Code

#ctaBtn {
  background-color: # ff4500; /* Orange background */
  color: # ffffff; /* White text * /
  font-size: 20px; /* Larger font size */
  /* Additional styles for the CTA button */
}

Accessibility Enhancement with IDs

IDs contribute altogether to the accessibility of web pages. Screen recorders and assistive innovations depend on legitimate HTML markup to provide a significant encounter for users with inabilities. Utilizing IDs to make milestone districts within a page improves route and cognizance for all users.

Code

<header id = " mainHeader " >
  <!-- Content of the header -->
</header>

<nav id = " mainNav " >
  <!-- Navigation menu items -->
</nav>

<footer id = " mainFooter " >
  <!-- Content of the footer -->
</footer>

JavaScript Interactions: Targeting with Precision

In JavaScript, IDs are fantastic targets for dynamic interactions. From making responsive routes to refreshing content based on user input, IDs offer a degree of precision that guarantees explicit elements are designated and controlled easily.

Code

<input type = " text " id = " userInput " placeholder = " Enter text " >
<button  > Update Content </button>

<div id = " dynamicContent " >
  <!-- Initial content of the dynamic div -->
</div>

<script>
  function updateContent() {
    var userInputValue = document.getElementById(" userInput ").value;
    document.getElementById("dynamicContent").innerHTML = userInputValue;
  }
</script>

Compelling Use of IDs

As we finish up our IDs in HTML, stressing the significance of balance is essential. While IDs offer precision and uniqueness, they ought to be used prudently to avoid intricate and difficult-to-maintain code. A smart mix of classes for gathering and IDs for explicitness provides a viable and versatile way to deal with web development.

Example:

Code

<!DOCTYPE html>
<html lang = " en " >
<head>
  <meta charset = " UTF-8 " >
  <meta name = " viewport " content = " width = device-width, initial-scale = 1.0 ">
  <style>
    /* CSS */
    #ctaBtn {
      background-color: #ff4500; /* Orange */
      color: #ffffff; /* White */
      font-size: 20px;
      padding: 10px;
      border: none;
      border-radius: 5px;
      cursor: pointer;
    }

    #mainHeader {
      background-color: #333;
      color: #fff;
      padding: 10px;
    }

    #mainNav {
      background-color: #666;
      color: #fff;
      padding: 10px;
    }

    #mainFooter {
      background-color: #333;
      color: #fff;
      padding: 10px;
    }
  </style>
  <title> ID Example </title>
</head>
<body>

  <!-- HTML -->
  <button id = " ctaBtn "> Click Me Now! </button>

  <header id = " mainHeader ">
    <!-- Content of the header -->
    Header Content
  </header>

  <nav id = " mainNav ">
    <!-- Navigation menu items -->
    Navigation Menu
  </nav>

  <footer id = " mainFooter ">
    <!-- Content of the footer -->
    Footer Content
  </footer>

</body>
</html>

Output:

Conclusion

The main contrast between them is that "id" is remarkable on a page and can apply to all things considered one element, while "class" selector can apply to various elements.

Next TopicFigma to HTML

← prev next →