HTMLn

HTMLn is a hypothetical markup language that extends HTML with native component composition, declarative data binding, and improved accessibility. It is not an official standard and has no widespread browser support; it exists primarily in speculative discussions and experimental projects.

Design goals focus on enabling modular user interfaces while preserving backward compatibility with existing HTML content, providing a declarative programming model, and improving performance and accessibility through encapsulated components and semantic annotations.

Key concepts include components with encapsulated templates and styles, a data binding system that synchronizes the DOM with a model, and a set of new elements and attributes such as n-component and n-bind that integrate with HTML syntax. HTMLn aims to compile to standard HTML, CSS, and JavaScript or to run on augmented engines.

Syntax and usage resemble HTML but introduce a small set of specialized constructs for defining and instantiating components. Components can be defined once and reused, with bindings mapping data to attributes or content. Rendering combines templates with the current state to produce the DOM.

Impact and tooling: in experiments, HTMLn tooling includes transpilers, validators, and runtime libraries that polyfill features or convert HTMLn constructs into native HTML and JavaScript. Support varies by platform, and adoption remains limited.

See also: HyperText Markup Language, Web Components, template engines, and data binding concepts.