Official description
This page W3C describes the header element as follows:
The header element represents Introductory content for its Nearest
Ancestor main element or sectioning content or sectioning root
element. A header typically contains a group of Introductory or
navigational aids.
Translating:
The header element represents introductory content for your
nearest main ancestor or content storage or
Root element processing. A header typically contains a group
of introductory or navigational aids.
So your statement is not exactly correct:
...is a tag indicating a section of the page, in case the top...
This is because, semantically, the element is used to present an introductory content, but not just to make a section of the top.
Mom, who’s my dad?
The MDN speaks that the tag <aside>
may have any parent element that accepts flow content.
Any element that accepts flow content. Note that an element
<aside>
shall not be descended from an element <address>
.
Moreover, this page W3C (example 20) proves what has been said by the following code::
<article>
<header>
<h1>Flexbox: The definitive guide</h1>
<aside>
<header>
<h2>About the author: Wes McSilly</h2>
<p><a href="./wes-mcsilly/">Contact him! (Why would you?)</a></p>
</header>
<p>Expert in nothing but Flexbox. Talented circus sideshow.</p>
</aside>
</header>
<p><ins>The guide about Flexbox was supposed to be here, but it
turned out Wes wasn’t a Flexbox expert either.</ins></p>
</article>
Completion
Given this, and adding, I often think that <aside>
comes from an English phrase: aside from content (apart from the content).
Thus, it is clearly perceived that it can be used "next to" content, no matter if it is a paragraph or header.
I think the lack of use of interrogation (
?
) in the text of your question left her a little confused. It is not well known where is a question and where is a statement.– Sam
In my view Aside is a content classified as complementary, or the part, and it can be present in Sctions, Articles, Headres, etc., it is a secondary element, but that is part of where it is inserted.
– hugocsl
face was bad was in a hurry I’ll spend more attention to that
– loser