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HTML elements

HTML documents are defined by HTML elements.

HTML elements

HTML elements refer to everything from the start tag to the end tag code.

Like this

End tag ##

##
;
##Start tag Element content
This is a paragraph

This is a link


##

Note: The start tag is often called an opening tag, and the end tag is often called a closing tag.

HTML element syntax

  • ##HTML elements start with a start tag

  • HTML elements are terminated with a closing tag

  • The content of the element is the content between the opening tag and the closing tag

  • Some HTML elements have empty content

  • Empty elements are closed in the opening tag (end with the end of the opening tag)

  • Most HTML elements can have attributes

Tip: You will learn more about attributes in the next chapter of this tutorial.

Nested HTML Elements

Most HTML elements can be nested (can contain other HTML elements).

HTML documents are composed of nested HTML elements.

##

There are three html elements here


;



##The above example contains three HTML elements. They are

element, element, element

HTML example explanation

element:

##

This is my first paragraph.

This

element Defines a paragraph in an HTML document.

This element has a start tag

, and an end tag

.

The content of the element is: This is my first paragraph.

Element:

##

This is my The first paragraph.



element defines the body of the HTML document.
This element has a start tag , and an end tag . The

element content is another HTML element (p element).

Element:

This is my first paragraph.




element defines the entire HTML document.

This element has a start tag , and an end tag .

The content of the element is another HTML element (body element).

#Don't forget the closing tag

##Even if you forget to use the closing tag, most browsers will do it correctly Display HTML:

This is a paragraph

This is a paragraph


##Example 

    php.cn 

  
This is a paragraph 
This is a paragraph
Program running result:

This is a paragraph

This is a paragraph

The above example will work fine in most browsers, but don’t rely on this approach. Forgetting to use a closing tag can produce unpredictable results or errors.

Note

: Future versions of HTML will not allow the closing tag to be omitted.

Empty HTML element

An HTML element without content is called an empty element. Empty elements are closed in the opening tag.


is an empty element without a closing tag (
tag definition wraps).

In XHTML, XML, and future versions of HTML, all elements must be closed.

Adding a slash in the opening tag, such as
, is the correct way to close an empty element, and is accepted by HTML, XHTML, and XML.

Even though
is valid in all browsers, using
is actually a longer-term guarantee.

##Tip

:
HTML tags are not case-sensitive:

is equivalent to

, but lowercase is recommended


Continuing Learning

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这里有三个html元素

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