type species | High-definition television | type | Portable Document Format | high-definition television | Type (biology) | Diabetes mellitus type 1 | High-definition video | Type O Negative | Visa (document) | Diabetes mellitus type 2 | Volkswagen Type 2 | Type I and type II errors | high-definition video | Type 56 assault rifle | type (biology) | Type 38 | Document management system | Bugatti Type 57 | Type II supernova | Type Directors Club | Type 38 rifle | Document Object Model | visa (document) | type genus | Type 59 | Type 45 destroyer | Jaguar S-Type | Identity document | Handley Page Type O |
While Bert Bos of the World Wide Web Consortium has produced a Document Type Definition that includes syntax for the blink element (defining it as a phrase element on a par with elements for emphasis and citations), the comments in the DTD explain that it is intended as a joke.
For validation purposes, the documents can be validated against DTD, W3C XML Schema, RELAX NG, Schematron, NRL and NVDL schemas.