HTML Elements
HTML documents are defined by HTML elements.
HTML Elements
An HTML element is everything from the start tag to the end tag:
| Start tag * |
Element content |
End tag * |
| <p> |
This is a paragraph |
</p> |
| <a href="default.htm" > |
This is a link |
</a> |
| <br /> |
|
|
* The start tag is often called the opening tag. The end tag is often called the closing tag.
HTML Element Syntax
- An HTML element starts with a start tag / opening tag
- An HTML element ends with an end tag / closing tag
- The element content is everything between the start and the end tag
- Some HTML elements have empty content
- Empty elements are closed in the start tag
- Most HTML elements can have attributes
(You will learn about element attributes in the next chapter of this
tutorial)
Nested HTML Elements
Most HTML elements can be nested (can contain other HTML elements).
HTML documents consist of nested HTML elements.
HTML Document Example
|
<html>
<body>
<p>This is my first paragraph</p>
</body>
</html>
|
The example above contains 3 HTML elements.
Example Explained
The <p> element:
|
<p>This is my first paragraph</p>
|
The <p> element defines a paragraph in the HTML document
The element has a start tag <p> and an end tag </p>
The element content is: This is my first paragraph
The <body> element:
<body>
<p>This is my first paragraph</p>
</body>
|
The <body> element defines the body of the HTML document
The element has a start tag <body> and an end tag </body>
The element content is another HTML element (a paragraph)
The <html> element:
<html>
<body>
<p>This is my first paragraph</p>
</body>
</html>
|
The <html> element defines the whole HTML document.
The element has a start tag <html> and an end tag </html>
The element content is another HTML element (the body)
Don't Forget the End Tag
Most browsers will display HTML correctly even if you forget the end tag:
<p>This is a paragraph
<p>This is a paragraph
|
The example above will work in most browsers, but don't rely on it.
Forgetting the end tag can produce unexpected results or errors.
Note: Future version of HTML will not allow you to
skip end tags.
Empty HTML Elements
HTML elements without content are called empty elements. Empty elements can
be closed in the start tag.
<br> is an empty element without a closing tag (it defines a line break).
In XHTML, XML, and future versions of HTML, all elements must be closed.
Adding a slash to the start tag, like <br />, is the proper way of closing empty elements, accepted by HTML, XHTML and XML.
Even if <br> works in all browsers, writing <br /> instead is more future
proof.
HTML Tip: Use Lowercase Tags
HTML tags are not case sensitive: <P> means the
same as <p>. Plenty of web sites use uppercase HTML tags in their
pages.
W3Schools use lowercase tags because the World Wide Web Consortium (W3C) recommends lowercase in
HTML 4, and demands lowercase tags in future versions of (X)HTML.
Need an easy way to get data into XML, or transform XML to another format?
MapForce lets you map XML data to/from any combination of XML, database, flat file, Excel 2007, XBRL, or Web services data.
Then it transforms data instantly or auto-generates royalty-free data integration code for recurrent conversions.
Download a free, fully functional 30-day trial to experience the following features:
- Easy-to-use, graphical data mapping interface
- Instant data transformation
- XSLT 1.0/2.0 and XQuery code generation
- Java, C#, and C++ code generation
- Advanced data processing functions
- Support for all major relational databases including SQL Server, IBM DB2, Oracle, and more
- Visual Studio & Eclipse integration
Download a fully-functional trial today!
|
|
|
| 
