No rendering of simple element (<x-element/>) without content tag

[bdulac]

Really sorry to open another issue. I am a beginner with web components, so please forgive me if this is a misunderstanding...

I try to write a polymer component that doesn't need a content: only a single attribute.
It seems to me logical to write the template without a <content> tag: perhaps is this a misuse but it seems to work.
The rendering is fine with the <x-element></x-element> syntax.
But it does not work with the <x-element/> syntax.
Here is a gist of an HTML doc of my problem (the problematic case is in red) : https://gist.github.com/bdulac/5c39b740ec7a52a15e8b

[dhubler]

Unless I'm mistaken, this is really about requiring end tags.
Surprisingly, the HTML spec lists a finite set of html tags that don't
require end tags. If you're inventing tags thru polymer, requiring an end
tag is in compliance with HTML spec. Having said this, I learned this the
hard way as I'm sure many others will too. Maybe there's a way to detect
these and complain loudly v.s. silently failing. Until then, always add
end tags.

On Mon, Nov 24, 2014 at 2:52 PM, Bérenger Dulac notifications@github.com
wrote:

Really sorry to open another issue. I am a beginner with web components,
so please forgive me if this is a misunderstanding...

I try to write a polymer component that doesn't need a content: only a
single attribute.
It seems to me logical to write the template without a tag:
perhaps is this a misuse but it seems to work.
The rendering is fine with the syntax.
But it does not work with the syntax.
Here is a gist of an HTML doc of my problem (the problematic case is in
red) : https://gist.github.com/bdulac/5c39b740ec7a52a15e8b

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#962.

[ebidel]

Custom elements are not allowed to be void elements (self-closing). This is part of the custom elements spec. Dupe of #899