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It turns out it's not. Self-closing tags just aren't a thing in HTML — the /> is simply ignored by browsers altogether. In other words, this...
Svelte, however, treats <div /> as <div></div>. For a framework that prides itself on being a superset of HTML, this is a glaring error.
I think the right thing to do is disallow self-closing non-void HTML tags (this only applies to HTML, not other namespaces). This is a breaking change, but the alternatives are:
Ideally we would also disallow self-closing void elements (i.e. <input> rather than <input />), but whether or not this is realistic depends on whether Prettier's current habit of adding an unnecessary /> to void elements prevents us from doing that.
