Mastering the “ASIDE” Tag for Complementary Content

3 min read

In the realm of semantic HTML5, the <aside> tag plays a pivotal role in defining content tangentially related to a webpage’s main content. This beginner-friendly guide will delve into the nuances of the <aside> tag, demonstrating how it can be effectively utilized in web development.

What is the HTML <aside> Tag?

The <aside> Tag in HTML5 are used to mark up content that is indirectly related to the main content of a page. This could include sidebars, call-out boxes, advertisements, or other types of information that, while related, stand apart from the primary content.

Characteristics of the <aside> Tag

  • Semantic HTML: As a semantic element, the <aside> tag helps define the structure and meaning of web content, improving accessibility and SEO.
  • Not Just for Sidebars: Despite commonly being used for sidebars, <aside> is versatile and can be used for any connected content yet separate from the main content.
  • Enhances Page Layout: It’s often used in page layouts to house supplementary information, enriching the overall user experience.

Example Code with the <aside> Tag

<!DOCTYPE html>
    <title>Aside Tag Example</title>

        <h1>The Rise of Web Development</h1>
        <p>Web development has dramatically evolved over the past decade...</p>
        <!-- Main article content -->

        <h2>Related Articles</h2>
            <li><a href="html5-intro.html">Introduction to HTML5</a></li>
            <li><a href="css3-basics.html">Basics of CSS3</a></li>
            <li><a href="js-advancements.html">Advancements in JavaScript</a></li>


In this example, the <aside> tag is used to create a section for related articles, supplementing the main article content without being a direct part of it.

Best Practices

  • Relevance is Key: Ensure that the content within <aside> is related to the main content, even if it is not a central part of it.
  • Avoid Misuse: Don’t use <aside> for main content or content that is critical to understanding the primary content.
  • Combine with Other Elements: <aside> can be used alongside other semantic elements like <article>, <section>, and <header> to create a well-structured and meaningful layout.


The <aside> tag is an essential tool in the arsenal of semantic HTML5 elements. It helps clearly delineate supplementary content, enriching the user experience without detracting from the main content’s focus. As you continue to explore and master HTML5, the thoughtful integration of elements like <aside> will significantly enhance the structure and clarity of your web pages.

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