1. New structural elements
1) section
Represents a content block in the page, such as a chapter, header, footer or other part of the page, which can replace the previous div
2) article
Represents a piece of independent content on the page that is not related to the context, such as an article in a blog.
3) aside
Represents auxiliary information related to the content of the article element in addition to the content of the article element.
4) header
5)footer
6)hgroup
Used to combine the titles of an entire page or a content block within a page
7) figure
Represents an independent piece of stream content, generally representing an independent unit in the main stream content of the document, using
figcaptionAdds a title to the figure element
8)nav