What does single tag mean in html

In HTML, a single tag refers to a tag without a closing tag (no end tag), which is closed in the opening tag, that is, an empty tag; they do not exist in pairs, on a single tag Using a closing tag is invalid. Common single tags include: br, hr, img, input, link, meta, etc.

The operating environment of this tutorial: Windows 7 system, HTML5 version, Dell G3 computer.

In HTML, a single tag refers to a tag without a closing 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 start tag. There are no pairs (except 879b49175114808d868f5fe5e24c4e0b). On the contrary, they are paired. For example: 44a8922e6607b31d059827e4b04a93b916b28748ea4df4d9c2150843fecfba68 and ff9c23ada1bcecdd1a0fb5d5a0f18437f5a47148e367a6035fd7a2faa965022e are not empty tags.

In HTML, it is invalid to use a closing tag on an empty tag, for example: 0b9f73f8e206867bd1f5dc5957dbcb38. Such cases are invalid HTML.

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Commonly the following tags are empty tags

<area>
<base>
<br>
<col>
<colgroup> 
<command>
<embed>
<hr>
<img>
<input>
<keygen>
<link>
<meta>
<param>
<source>
<track>
<wbr>

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