The <article> command in HTML can be useful, even if most implementations do not do much with it. For example, a browser could offer the possibility to print or display only the contents of a single <article> block, or to display marks in the scrollbar for which positions in the scrollbar correspond to the contents of the <article> block. It would also be true of <time>; although many implementations do not do much with it, they could do stuff with it. And, also of <h1>, <h2>, etc; although browsers have built-in styles for them, allowing the end user to customize them is helpful, and so is the possibility of using them to automatically display the table of contents in a separate menu. None of these behaviours should need to be standardized; they can be by the implementation and by the end user configuration etc; only the meaning of the commands will be standardized, not their behaviour.