When minifying HTML with self-closing non-void elements (e.g., <custom attr="value"/>), the minifier corrupts the output because it treats these as opening tags and looks for closing tags that don't exist.

While I realize that the HTML5 spec says the / should be ignored on non-void HTML elements, in practice many HTML documents (especially those generated by tools or frameworks) use self-closing syntax for custom elements. In our case, this is just another templating mechanism.

I can provide a patch if there's interest - any opinion on if this should be default behaviour or configured?