Compliance Level
Telerik RadInput provides complete XHTML compliance. The default HTML output generated is fully XHTML 1.1 compliant.
XHTML
XHTML stands for EXtensible HyperText Markup Language and it is a stricter and cleaner version of HTML recommended by W3C (World Wide Web Consortium). XHTML is the effective inheritor of HTML 4.01 and although it is almost identical to its predecessor it is aimed to replace it.