HTML tags are used to define the elements and structure on a web page. While most HTML tags come in pairs and require a start tag and a closing tag, some tags do not require closing.
The following are HTML tags that can exist independently:
No content tag
<li>## : Line break
<li>: Horizontal line
<li>: Image
<li>: Form input field
<li>: Style sheet link
<li>: Metadata
<li><code>: Non-frame content</code>
</li>
</ul>
<p>Tag containing only text<strong></strong></p>
<ul>
<li>< ;base><code>: Base URL</code>
</li>
<li><command><code>: Browser command</code>
</li>
<li><keygen><code>: Key generator </code>
</li>
<li><param><code>: Plug-in parameters </code>
</li>
</ul>
<p>Special tags<strong></strong></p>
<ul>##< !DOCTYPE><li>: Document type declaration <code></code>
</li><html><li>: HTML root element <code></code>
</li><head><li>: Contains the document header Information<code></code>
</li><body><li>: Contains the document body content<code></code>
</li>
</ul>Note:<p><strong></strong></p>Some HTML tags do not need to be closed in some contexts. For example, <ul><td><li>, <code><th></code>, and <code><li></code> can be used without closure in tables and lists. <code></code>HTML5 introduced many tags that do not need to be closed, such as </li><header><li>, <code><footer></code> and <code><nav></code> . <code></code>
</li>
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