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Tags that can be omitted

Tags with closing tags are not allowed: area (define areas in the image map), base (specify default addresses or default destinations for all links on the page), br, col (define attribute values for one or more columns in the table), embed (define embedded content, such as plug-ins-5), hr, img, input, keygen, link, meta, param, source, track, wbr

Tags with closing tags can be omitted: li, dt, dd, p, rt, optgroup, option, colgroup, thread, tbody, tr, td, th

Tags that can be omitted completely: html, head, body, colgroup, tbody

New label

Section: a content block in a page that contains sections, pages, footers, or other parts of the page, and H2, h3. And other tags are used together to represent the document structure.

Article: represents a piece of independent content on a page that has nothing to do with context, such as an article.

Aside: defines something other than article. The content of aside should be related to the content of article.

Header: the content block in the page or the title of the entire page.

Footer: a content block on a page or a footnote for the entire page.

Hgroup: a combination of content blocks on a page or the title of the entire page.

Nav: the part of the navigation link.

Figure: specifies independent streaming content (images, diagrams, photos, code, etc., which should be relevant to the main content, but should not affect the document stream if deleted).

Video: video. Exp: video

Audio: audio.

Embed: used to embed content (including various media).

Mark: change color, follow.

Progress: progress bar. Exp:

Time: defines a date or time, or both. This mark is for the retrieval engine, and the engine will know that this piece represents a time according to this mark. There is an attribute of pubdate, and when the engine reads it, it knows that the value in the datatime in this block is the release time of this article, and there are two special characters T and Z in this time. T represents the delimiter of date and time, and Z represents the standard format of time. Exp:

Datalist: defines a list of options. Use this element with the input element to define the possible values of input. Exp:

Output:exp:0100+=

Global attribute

Data-type: custom attributes.

Hidden: hidden, single tag.

Spellcheck: correct the syntax of the input. Exp:

Tabindex:tab key order.

Contenteditable: modify the content. Exp:

Make the whole text editable: window.document.designMode= "off"; / / off off, on: editable

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