HTML HyperText Markup Language
HTML is the markup language of the web: content wrapped in tags that describe structure, with CSS supplying the presentation. Unlike a word processor document it is not paginated, and it makes no assumption about the size of the surface it will be read on.
That reflow-first design is its strength and its constraint. HTML adapts to any viewport, but it has no native concept of a page, so anything defined by pagination, such as fixed margins or printed page numbers, has to be imposed on it from outside.
Its reach is unmatched. Any browser on any device renders HTML without installation, which makes it the natural target when a document's purpose is to be read by whoever finds it rather than filed away.[1][2][3][4]