Attribute Name Case Sensitive

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Q

Is Attribute Name Case Sensitive?

✍: FYIcenter.com

A

Yes, XHTML attribute names are case sensitive. You must write all attribute names in lower case letters.

Here are some valid and invalid attribute names:

<a href="http://dev.fyicenter.com"> - Valid attribute name.
<a HREF="http://dev.fyicenter.com"> - Invalid attribute name, must use lower case letters.
<script Type="text/javascript"> - Invalid attribute name, must use lower case letters.

Note to HTML document authors: HTML element attribute names are not case sensitive. But XHTML element attribute 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 attributes.

⇒ Quoting HTML Element Attribute Values

⇐ Writing HTML Element Attributes

⇑ HTML Tag and Attribute Syntax

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