[masklinn]

The soft-requirement for hyphens is a form of namespacing: nothing precludes whatwg from adding <use> or <want> elements to HTML in the future, and that would conflict with and possibly break your page.

[1718627440]

To prove your point, <use> already exists although in SVG. https://developer.mozilla.org/en-US/docs/Web/SVG/Reference/E...