The HTML <aside> tag provides information about the main content. According to W3C definition, the <aside> element represents content that forms the main textual flow of a document.

HTML aside is a new tag introduced in HTML5.

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HTML aside tag example

<p>I don't want to live in london, I wish; I could buy a flat in newyork.</p>  
<aside>  
  <h3>NewYork</h3>  
  <p>NewYork is the beautiful and advanced city.</p>  
</aside>  

Output:

I don’t want to live in london, I wish; I could buy a flat in newyork.

NewYork

NewYork is the beautiful and advanced city.

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HTML aside tag also supports global and event attributes in HTML.

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Supporting Browsers

Element	Chrome	IE	Firefox	Opera	Safari
<aside>	Yes	Yes	Yes	Yes	Yes