The markup language <aside> tag provides data concerning the most content. per W3C definition, the <aside> component represents content that forms the most matter flow of a document.
HTML aside could be a new tag introduced in markup language five.
Example:-
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>aside tag</title>
</head>
<body>
<h1>Amitabh Bachchan</h1>
<p>Amitabh Bachchan born Amitabh Srivastava; 11 October 1942 is an Indian actor, film producer, television host, occasional playback singer and former politician known for his work in Hindi cinema.</p>
<aside>
<h4>Details</h4>
<p>He is regarded as one of the most influential actors in the history of Indian cinema. During the 1970s–1980s, he was the most dominant actor in the Indian movie scene; the French director François Truffaut called him a "one-man industry".</p>
</aside>
</body>
</html>
Output:-
Amitabh Bachchan
Amitabh Bachchan born Amitabh Srivastava; 11 October 1942 is an Indian actor, film producer, television host, occasional playback singer and former politician known for his work in Hindi cinema.