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This article introduces you whether the html tag appears in pairs, the content is very detailed, interested friends can refer to, hope to be helpful to you.

Html tags do not necessarily appear in pairs, but there are also separately rendered tags, that is, tags without closed tags; they are elements that are closed at the beginning of the tag, and there are no pairs, such as br, hr, img, input, link, meta, param, source, and so on.

The operating environment of this tutorial: windows7 system, HTML5 version, Dell G3 computer.

In HTML, keywords whose tags are surrounded by angle brackets, usually in pairs such as and, are called "double tags". The start and end tags are also known as open and closed tags.

There are also separate tags, such as:

And so on, this is called "single mark".

A single tag refers to a tag that does not have a closed tag (no closing tag), that is, an empty tag.

Empty tags are HTML tag elements with no content, they are elements that are closed in the opening tag, and there are no pairwise cases (except). On the contrary, they are not empty tags.

In HTML, it is invalid to use a closed tag on an empty tag, for example:. Such a situation is invalid, HTML.

Html unpaired tags (single tag)

You can insert a simple newline character

The tag is empty (meaning it does not end the tag, so this is wrong:

). In XHTML, put the closing tag in the opening tag, that is.

Define theme changes (such as topic shifts) in the HTML page and display them as a horizontal line

Defines the area inside the image map (image mapping refers to an image with clickable regions).

Specify a default address or default destination for all links on the page

Define the image in the HTML page

Specifies the input field in which the user can enter data

Defines the relationship between documents and external resources, and the most common use is to link stylesheets

Provides metadata for HTML documents The metadata will not be displayed on the client side, but will be parsed by the browser.

The META element is usually used to specify the description of the web page, keywords, the last modification time of the file, the author, and other metadata.

Metadata can be invoked using browsers (how to display content or reload pages), search engines (keywords), or other Web services.

Defines the default color, size, and font for all text in the document

Allows you to specify run-time settings for objects that are inserted into an XHTML document, that is, this tag provides parameters for the or tags that contain it

Specifies the column attributes for each column within the element By using tags, you can apply styles to the entire column without having to repeat styles for each cell or row.

Define a specific window (frame) in frameset Each frame in frameset can set different properties, such as border, scrolling, noresize, and so on.

Defines a container for embedding external applications or interactive programs (plug-ins).

Specifies the key pair generator field to use for the form.

Define media resources for media elements such as and

About whether the html tags appear in pairs or not, I hope the above content can help you to some extent and learn more knowledge. If you think the article is good, you can share it for more people to see.

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