>> because the content node actually exists in the DOM

It's not quite this simple. The DOM you see in the inspector under polyfill
represents the render tree. Content nodes are removed from the render tree
in all cases.

In the normal queryable DOM (i.e. if you access DOM via JavaScript) you
should see the content nodes there just fine. This should mirror the
behavior of the native Shadow DOM. (The converse is that your distributed
nodes will be sitting there inside their final projection target when
looking at the DOM through inspector under polyfill, but only appear in
their starting point in light-dom under native).

I believe the actual issue here is with polyfilling the CSS engine, which
is a bit more subtle.

In any case, it's true this is worthy of documentation.

S

On Mon, Feb 10, 2014 at 10:16 AM, Jan Miksovsky <[email protected]> wrote:

> I came across an issue today in some styling that worked under native
> Shadow DOM, but didn't work under the polyfill.
>
> A repro case (http://jsbin.com/sukek/4/edit) shows that it's possible to
> style a <content> node in native Shadow DOM, because the content node
> actually exists in the DOM. The polyfill doesn't actually put a node in the
> DOM to represent a <content> node. So one can't reference it in CSS
> selectors, refer to it with this.$.id, etc.
>
> One can work around these problems, but I didn't see any of this <content>
> node polyfilling details captured in the useful Polyfill 
> Details<http://www.polymer-project.org/platform/shadow-dom.html#polyfill-details>
>  section.
> It'd be helpful to add a bit about how distribution works in the polyfill,
> and mention that <content> nodes won't actually end up in the DOM.
>
>  Follow Polymer on Google+: plus.google.com/107187849809354688692
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