By default, when you are working with browsers that support HTML 4.0 or later, ASP.NET pages and controls render markup that is compatible with the XHTML 1.0 Transitional standard. However, under some circumstances, you might not want ASP.NET to render XHTML markup. This is typically true when you have existing pages that rely on tags or attributes that would ordinarily be prohibited by XHTML.
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Only rendering changes that are likely to break existing applications are reverted to their old behavior. There is no mechanism to revert all changes made to comply with the XHTML specification.
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Default Configuration
The following default xhtmlConformance element is not explicitly configured in the machine configuration file or in the root Web.config file, but is the default configuration returned by an application in the .NET Framework version 2.0.
<xhtmlConformance mode="Transitional"/>