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    <p>If you're using full-blown <a href="https://github.com/dglazkov/Web-Components-Polyfill" rel="nofollow">Web Components</a> instead of just Shadow DOM, you should be able to get at the parent taskbar element from the Javascript. Something like this:</p> <pre><code>&lt;element&gt; &lt;template&gt; ... &lt;/template&gt; &lt;script&gt; if (this !== window) { this.lifecycle({ created: function() { this.parentElement.attributes['side'].nodeValue; // "right" } }); } &lt;/script&gt; &lt;/element&gt; </code></pre> <p>This, however, makes it so that you can no longer use the applist component outside of a taskbar, which generally is a bad thing. We should try and make components as modular, independent, and reusable as possible. Ask yourself, "What exactly do I need to know about the parent element?" Could you instead write the applist as</p> <pre><code>&lt;applist scrollable="right"&gt;... </code></pre> <p>The duplication is a small price to pay for the ability to use this component anywhere you want. Who knows? In the future you may decide to use taskbar and applist in such a way that <code>side="right"</code> but <code>scrollable="bottom"</code>!</p> <p><strong>Update</strong></p> <p>If you want to allow the styling of the Shadow DOM elements to change dynamically with changes to the host element, you will soon be able to use the <a href="http://dvcs.w3.org/hg/webcomponents/raw-file/tip/spec/shadow/index.html#host-at-rule" rel="nofollow">@host @-rule</a>. The spec isn't clear here at all, but I think it will be used like this (taken from <a href="https://www.w3.org/Bugs/Public/show_bug.cgi?id=18483#c1" rel="nofollow">a comment on a bug for the W3 spec for Web Components</a>):</p> <pre><code>@host { div { background-color: white; } .warning { background-color: yellow; } .important .warning { background-color: orange; } } </code></pre> <p>This would (I think) give the host a default background color of white, which would be overriden to yellow if the host has the class <code>warning</code>. It would also style a warning element inside the host with a background color of orange <strong>if</strong> the host has the class <code>important</code>.</p>
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    1. POSelectors across upper-boundary or what?
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    1. COOk, I can dublicate, but it doesn't affect anyway. The point is to have _dynamic_ changes on shaded tree according to external changes, such as provided by CSS. The only way I see for now to change the style of shadow is to put some classes/id/inline-styles right in the shadow. And it's sad...
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    2. COAnother example is that you have super-dooper-button, made with one tag and Shadow DOM. And you have to put many of that buttons in the some panel, but there they must look little different (color, for ex.)
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    3. CODoes my update answer your problem?
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