From the comments here and elsewhere, you can see this definition was not accepted by developers. For the HTML "aside" element, see HTML5#Differences from HTML 4.01 and XHTML 1.x. Create aside object− Syntax. The aside 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. I know it'll work, but on MDN you can read: "Do not use the