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Showing content from https://webplatform.github.io/docs/html/elements/hgroup below:

hgroup · WebPlatform Docs

hgroup Summary

(Obsolete) The hgroup element (<hgroup>) is typically used to group a set of one or more h1-h6 elements — to group, for example, a section title and an accompanying subtitle. The hgroup element (<hgroup>) element is obsolete in HTML5.

Overview Table

DOM Interface: HTMLElement

Obsolete

The hgroup element is obsolete in HTML. Consider the header element, or a <span class="subheading"> element with differentiated styling.

Point

The element is used to group a set of h1–h6 elements when the heading has multiple levels, such as subheadings, alternative titles, or taglines. [Example A]
For the purposes of document summaries, outlines, and the like, the text of hgroup elements is defined to be the text of the highest ranked h1–h6 element descendant of the hgroup element, if there are any such elements, and the first such element if there are multiple elements with that rank.
The rank of an hgroup element is the rank of the highest-ranked h1–h6 element descendant of the hgroup element, if there are any such elements, or otherwise the same as for an h1 element (the highest rank).

Examples

The following is an example of a valid heading. The hgroup masks the h2 element (which acts as a secondary title) from the outline algorithm.

<hgroup>
 <h1>Dr. Strangelove</h1>
 <h2>Or: How I Learned to Stop Worrying and Love the Bomb</h2>
</hgroup>

For document summaries and outlines, the text of hgroup elements is defined as the text of the highest ranked h1-h6 element descendant, or the first such element if there are multiple elements with the highest rank. If there are no such elements, then the text of the hgroup element is the empty string. The following script demonstrates how to implement this behavior.

function findHeadings(node)
{
    
    var hg = node.getElementsByTagName("HGROUP");
    if(hg.length>0)
        node = hg[0];
    
    var ranks = [ "H1","H2","H3","H4","H5","H6" ];
    for (var i=0; i<ranks.length; i++) {
        var headings = node.getElementsByTagName(ranks[i]);
        if(headings.length>0)
            return headings[0].textContent;
    }
    
    return "";
}

Notes Remarks

Windows Internet Explorer 9. The hgroup element is only supported for webpages displayed in IE9 Standards mode. For more information, see Defining Document Compatibility. The hgroup element is used to group a set of h1-h6 elements when the heading has multiple levels, such as subheadings, alternative titles, or taglines. Other elements of heading content in the hgroup element indicate subheadings or subtitles.