Here's what the spec says :
A pending element is a section of a page that consists of content regarding content around the element and which can be considered separate from that content. Such sections are often presented as side panels in a print shop.
An element can be used for typographic effects, such as pulling quotes or sidebars, for advertising, for groups of navigation elements, and for other content that is considered separate from the main content of the page.
Leaving aside the fact that advertising is referred to as OK in the second paragraph, the source of the confusion is clear. These two paragraphs are somewhat controversial.
The first paragraph states that it should be used for content tangent to and , considered separately from the main content.
The second paragraph requires that the content be considered separate main content.
I suspect this confusion has arisen due to the choice of an “aside” name that has a “tangential relationship” to the connotation in English, while an alternate rejected name for an element that was a “sidebar” does not.
I'm not quite sure why the “sidebar” was rejected, but perhaps it was considered too presentation and not meaningful enough. Unfortunately, when choosing "to the side", the author introduced semantics, which in fact were not intended and were not useful.
Fortunately, in this case we do not need to decipher this contradiction. Advertisements are specifically called suitable for <aside>
, so the problem is clearly resolved.
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