Heads-up: this could be more of a question for the group in which HTML
custom elements are discussed but I figure the intersection with Polymer
developers is rather large —

I'm trying to understand whether it is possible to declare a custom HTML
element that can wrap arbitrary subelements and 'yield' the rendering of
those subelements at a determined insertion point. The syntax below is
approximative but should provide a goods idea of what I'm trying to do

<my-list header="My Header" footer="My Footer">
  <li>foo</li>
  <li>bar</li>
</my-list>

<dom-module id="my-list">
  <template>
    <p>{{header}}</p>
    <ul>
      <!-- what goes here? can I automatically insert the <li>s declared
above?>
    </ul>
    <p>{{footer}}</p>
  </template>
</dom-module>

This is a simple example — in the greater scheme of things, I'd like to be
able to insert/handle arbitrary content whose type may not be known ahead
of time (e.g. a <div> or <my-other-element>, etc…).

Basically I'd like to know whether custom HTML elements have the
possibility to act as external layouts for other elements as opposed to
just encapsulated templates.

Cheers,
-Julien

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