I'm not sure that you can have self-closing custom tags in HTML5. Per [1], ...if the element is one of the void elements, or if the element is a foreign e

I'm not sure that you can have self-closing custom tags in HTML5. Per [1], ...if the element is one of the void elements, or if the element is a foreign element, then there may be a single U+002F SOLIDUS character (/). This character has no effect on void elements, but on foreign elements it marks the start tag as self-closing. The list of element types [2] is fairly short, so I think if you attempted to self-close a custom tag, behavior might depend on how the parser's error recovery treats custom elements. [1] http://w3c.github.io/html/syntax.html#start-tags http://w3c.github.io/html/syntax.html#start-tags [2] http://w3c.github.io/html/syntax.html#writing-html-documents-elements http://w3c.github.io/html/syntax.html#writing-html-documents...