<section> label , Define the sections in the document . Like chapters 、 header 、 Footers or other parts of a document . It's usually used for content in sections , Will start a new section in the document stream . It's used to represent common document content or application blocks , Usually consists of content and its title . but section An element tag is not an ordinary container element , It represents a piece of thematic content , Usually with a title .
<article> It's a special one section label , It is better than section It has more explicit semantics , It represents an independent 、 Complete related content block , Can be used independently of other content on the page . For example, a full forum post , A blog post , A user comment and so on . Generally speaking ,article There will be a title section （ Usually included in header Inside ）, Sometimes it includes footer.article Can be nested , The inner layer of the article For the outer layer article Labels have affiliation . for example , A blog post , It can be used article Show , Then some comments can be made in the form of article Embedded in it in the form of .
nav The tag represents a part of the page , It's a link group that can be used as page navigation , The navigation elements are linked to other pages or other parts of the current page , send html Code is more precise in terms of semantics , At the same time, the support for screen readers and other devices is also better .
aside Tags are used to load non text content , It's seen as a separate part of the page . The content it contains is separate from the main content of the page , Can be deleted , Without affecting the content of the page 、 The message of a chapter or page . Such as advertising , Groups of links , Sidebar, etc .
<header> The tag defines the header of the document , Usually some guidance and navigation information . It's not just written in the head of the page , It can also be written in the content of the web page . Usually <header> The label contains at least （ But not limited to ） A title tag （<h1>-<h6>）, It can also include <hgroup> label , You can also include table content 、 identification 、 Search form 、<nav> Navigation etc. .
footer Tag definition section or document The footer of , Contains information related to the page 、 Information about the article or part of the content , For example, the author or date of the article . As the page's footers , It generally includes copyright 、 Related documents and links . It and <header> Tag usage is basically the same , It can be used multiple times in one page , If you add after a section footer, So it's equivalent to the section's footers .
hgroup Tags are on pages or sections section The title element of （h1-h6） Are combined . for example , In a section you have continuous h The label elements of the series , You can use hgroup Wrap them up
Used to combine elements . It is mainly used for the combination of picture and picture description .
Tags define sounds , Like music or other audio streams
Tag definition video , Like movie clips or other video streams
The label defines the date or time , Or both
For media elements （ such as <video> and <audio>） Define media resources
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