The <hgroup> tag in HTML was used to group a set of <h1>, <h2>, <h3>, <h4>, <h5>, and <h6> elements together. This grouping was intended to represent a heading structure that spans multiple levels, providing a way to create a cohesive heading for a section or article.

Syntax:

<hgroup>
  <h1>Main Heading</h1>
  <h2>Subheading</h2>
</hgroup>

Key Characteristics:

1. Purpose:

   • The <hgroup> tag was used to group multiple headings that represent a single heading structure, particularly when the main heading and subheadings are closely related and part of the same conceptual group.

2. Usage:

   • It was intended to allow for a hierarchical and structured presentation of headings, making it possible to associate a primary heading with one or more subheadings.

Deprecation:

• HTML5: The <hgroup> tag was introduced in HTML5 but has since been deprecated. The HTML5 specification no longer recommends using <hgroup>, and it has been removed from the HTML Living Standard.

• Current Best Practice: Instead of using <hgroup>, it is now recommended to use appropriate heading tags (<h1>, <h2>, <h3>, etc.) without grouping them in <hgroup>. The hierarchical structure of headings is handled by using the heading tags alone, and the use of <hgroup> is considered unnecessary.

Example Before Deprecation:

<hgroup>
  <h1>Main Heading</h1>
  <h2>Subheading</h2>
</hgroup>

Modern Approach:

Instead of using <hgroup>, structure headings directly:

<h1>Main Heading</h1>
<h2>Subheading</h2>