Consider standard conform button usage

[Jamtis]

Officially <button> elements should only have "phrasing content" as stated in the MDN and in the W3C draft.

I think it's a longterm goal to use all native elements in a standardized way.

I came across this problem when I tried to compile <basic-arrow-direction> with kangax' htmlmin@1.3.0 (see kangax/html-minifier#565) which broke the code.

What's your opinion about replacing invalid buttons in the future?

[JanMiksovsky]

I don't believe it's the case that buttons can only contain phrasing content. At least one spec for the button element indicates that buttons can support for a broader variety of content types, including flow content.

In any event, it's clear that buttons should be able to contain custom elements. Generally speaking, I would think that a tool that processes HTML should permit the inclusion of custom elements anywhere.

To help answer the question about how tools like html-minifier should handle custom elements, I've raised this as a question on w3c/webcomponents.

[Jamtis]

Appreciate the effort.

[JanMiksovsky]

The latest spec indicates that custom elements can be used "where phrasing content is expected".

So I think HTML tools like htmlmin should be extended to support the use of custom elements inside of elements like <button>. You could file an issue on htmlmin and point at the new spec.

Many thanks for raising the original issue so that this could get officially resolved in a W3C spec. I don't think there's anything more for me to do here, so I'm going to close this issue.