XHTML Element Name Case Sensitive

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Q

Is XHTML Element Name Case Sensitive?

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A

Yes, XHTML element names are case sensitive. All element names must be written in lower case letters.

Here are some valid and invalid XHTML element names:

<html> - Valid name.
<HTML> - Invalid name, must use lower case letters.
<xhtml> - Invalid name, not defined by XHTML specification.
<Body> - Invalid name, must use lower case letters.

Note to HTML document authors: HTML element names are not case sensitive. But XHTML element names are case sensitive. If you are converting existing HTML documents to XHTML documents, you will get a lots of syntax errors about upper case letters used in HTML tags.

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