Introduction to XHTML: Differences between XHTML and HTML

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Learning XHTML: Differences Between XHTML and HTML

In the first section of this tutorial, we learned a few differences you must learn when writing XHTML:

XHTML tags must be closed
XHTML documents must be "well written"
XHTML tags must be in lowercase characters

XHTML tags must be closed

The first major differences between XHTML and HTML is the fact tags must be closed. What do we mean?

In HTML, this could be a structure of your document:

<html>
<head>
</head>
<body>
Hey there. I am your instructor for this course. 
This will be a great course!
This course will focus on XHTML.
Thanks for taking our course.
</body>
</html>

In XHTML, you must close each of your tags and you must close the tag. In normal HTML, you can close the tag with , however, since there is no "close" tag for , you can close it in XHTML by using . Older browsers will ignore everything after the space in .

XHTML Documents must be well written

Currently, browsers forgive most of your mistakes in writing your code. In XHTML, however, you must keep your documents well formed and well written. When you are creating a web page, you need to keep elements within their proper structure. For example:

is the proper structure of webpage.

XHTML Tags must be written in lower case

XHTML is a form of XML. XML considers lower and upper case to be different characters and different tags. In XHTML documents, you must use lower case characters for all tags.

Hi there, this is a test.

is incorrect. The correct code would be written:

Hi there, this is a test.

XHTML is a new way to write your HTML and the preferred method for web development. Find more web development tutorials here.

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