HTML documents are defined by HTML elements.
HTML Element Syntax
HTML element starts with a start tag
HTML element ends with an end tag
The content of the element is the sum of the start tag and the end tag Content between
Some HTML elements have empty content
Empty elements are closed in the start tag (end with the end of the start tag)
Large Most HTML elements can have attributes
Note: You will learn more about attributes in the next chapter of this tutorial.
Nested HTML Elements
HTML documents are composed of nested HTML elements. HTML document example The above example contains three HTML elements. HTML instance parsing The element: This element defines a paragraph in the HTML document. and an end tag <!DOCTYPE html>
<html>
<body>
<p>This is my first paragraph.</p>
</body>
</html>
<p>This is my first paragraph.</p>
This element has a start tag
The content of the element is: This is my first paragraph.
The
element:<p>This is my first paragraph.</p>
The
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).
The element:
<p>This is my first paragraph.</p>
The 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 display the HTML correctly:
This is a paragraph
This is a paragraph
The above example can also be displayed normally in the browser because the closing tag is optional.
But don’t rely on this approach. Forgetting to use a closing tag can produce unpredictable results or errors.
HTML Empty Element
An HTML element with no 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.
HTML Tip: Use lowercase tags
HTML tags are not case-sensitive:
is equivalent to
. Many websites use uppercase HTML tags.
W3CSchool uses lowercase tags because the World Wide Web Consortium (W3C) recommended lowercase in HTML 4 and will mandate lowercase in a future version of (X)HTML.
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