DOM Level 0:
DOM Level 1, a W3C Standard
DOM Level 2, a W3C Standard
DOM Level 3: Several Working Drafts:
Document Object Model (DOM) Level 3 Core Specification
Document Object Model (DOM) Level 3 XPath Specification Version 1.0
Document Object Model (DOM) Level 3 Abstract Schemas and Load and Save Specification
Document Object Model (DOM) Level 3 Views and Formatting Specification
Document Object Model (DOM) Level 3 Events Specification Version 1.0