HTML5 Aside Tag
The aside tag is new in HTML5, like several other tags such as the Nav tag in HTML5 , the Article tag in HTML5. Only latest browsers and versions, such as Internet Explorer 9, Firefox, Opera, Chrome, and Safari, support it. Microsoft IE8 and earlier versions, do not support this aside tag in HTML5.
According to ‘s definition, ”The element represents a section of a page that consists of content that is tangentially related to the content around the
aside element, and which could be considered separate from that content. Such sections are often represented as sidebars in printed typography.” However it seems to be a bit obscure. Anyway we know that the HTML5 aside tag is to contain those information/data either unrelated or loosely related to the main content of a page. W3C also says that: “The element can be used for typographical effects like pull quotes or sidebars, for advertising, for groups of nav elements, and for other content that is considered separate from the main content of the page.” This explanation however makes the definition of HTML5 aside tag easier to understand.
How to use the aside tag in HTML5?
So for better SEO, we can put content such as Ads in the aside tag, as normally they are not as important as other content on the same page at least to your site visitors. However we think the aside content should be related to the surrounding content somehow, it can’t be totally irrelevant.