An HTML element usually consists of a start tag and end tag, with the content inserted in between:

<tagname>Content goes here...</tagname>
The HTML element is everything from the start tag to the end tag:

<p>My first paragraph.</p>

Note:-  HTML elements with no content are called empty elements. Empty elements do not have an end tag, such as the <br> element (which indicates a line break).

Nested HTML Elements:- 

HTML elements can be nested (elements can contain elements). All HTML documents consist of nested HTML elements. This example contains four HTML elements:




Example Explained

The <html> element defines the whole document. It has a start tag <html> and an end tag </html>.
The element content is another HTML element (the <body> element).

<html>
 <body>

    <h1>My First Heading</h1>
    <p>My first paragraph.</p>

 </body>
</html>

<body> Tag

  • The <body> element defines the document body. 
  • It has a start tag <body> and an end tag </body>.
  • The element content is two other HTML elements (<h1> and <p>).



 <body>

    <h1>My First Heading</h1>
    <p>My first paragraph.</p>

 </body>

<h1> Tag
  • The <h1> element defines a heading.
  • It has a start tag <h1> and an end tag </h1>.
  • The element content is: My First Heading.
<h1>My First Heading</h1>

<p> Tag

  • The <p> element defines a paragraph.
  • It has a start tag <p> and an end tag </p>.
  • The element content is: My first paragraph.
<p>My first paragraph.</p>

End Tag 

Don't Forget the End Tag. Some HTML elements will display correctly, even if you forget the end tag:

<html>
 <body>

    <h1>My First Heading
    <p>My first paragraph

 </body>
</html>

The example above works in all browsers, because the closing tag is considered optional. 
Never Depend on this. It might produce unexpected results if you forget the end tag.

Empty HTML Elements

  • HTML elements with no content are called empty elements.
  • <br> is an empty element without a closing tag (the <br> tag defines a line break).
  • Empty elements can be "closed" in the opening tag like this: <br />.

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