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    <body><span class="vcard"><a class="email" href="mailto:rniwa&#64;webkit.org" title="Ryosuke Niwa &lt;rniwa&#64;webkit.org&gt;"> <span class="fn">Ryosuke Niwa</span></a>
</span> changed
              <a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - ::slotted doesn't work in nested shadow trees"
   href="https://bugs.webkit.org/show_bug.cgi?id=154765">bug 154765</a>
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           <td style="text-align:right;">Attachment #272449 Flags</td>
           <td>review?
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           <td>review+
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            <b><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - ::slotted doesn't work in nested shadow trees"
   href="https://bugs.webkit.org/show_bug.cgi?id=154765#c9">Comment # 9</a>
              on <a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - ::slotted doesn't work in nested shadow trees"
   href="https://bugs.webkit.org/show_bug.cgi?id=154765">bug 154765</a>
              from <span class="vcard"><a class="email" href="mailto:rniwa&#64;webkit.org" title="Ryosuke Niwa &lt;rniwa&#64;webkit.org&gt;"> <span class="fn">Ryosuke Niwa</span></a>
</span></b>
        <pre>Comment on <span class=""><a href="attachment.cgi?id=272449&amp;action=diff" name="attach_272449" title="patch">attachment 272449</a> <a href="attachment.cgi?id=272449&amp;action=edit" title="patch">[details]</a></span>
patch

View in context: <a href="https://bugs.webkit.org/attachment.cgi?id=272449&amp;action=review">https://bugs.webkit.org/attachment.cgi?id=272449&amp;action=review</a>

<span class="quote">&gt;&gt; LayoutTests/fast/shadow-dom/css-scoping-shadow-slotted-nested.html:55
&gt;&gt; +            outerShadow.appendChild(document.getElementById('outer-host-template').content.cloneNode(true));
&gt; 
&gt; BTW, I feel the current set of specs desperately needs a declarative way to attach shadow based on a template. Something like &lt;outer-host shadow=&quot;outer-host-template&quot;&gt; to replace all this boilerplate.</span >

Indeed.  We've suggested that three years but we've agreed to punt it in v1 so I guess that's that :(
It's really silly that attachShadow or defineElement doesn't take an optional argument though.
e.g.
document.defineElement('my-element', MyElementClass, {template: MyElementClass.template});
would go a long way to simplify this whole setup.</pre>
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