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.
Chemical element | Blink-182 | mercury (element) | Element Lad | The Fifth Element | chemical element | Mercury (element) | blink-182 | Finite element method | Classical element | Blinky Blink | Well-formed element | Sterol regulatory element-binding protein | Identity element | finite element method | Element of Crime | Blink | Synthetic element | Monoisotopic element | Linear element | Human Element | HTML element | Finite element method in structural mechanics | Finite Element Method | Element Skateboards | Element Six | electrical element | Boundary element method | Blink (film) | Basic service element |