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    <p>I've been working on this exact problem for the last few months.</p> <p>Bottom line there is a polyfill that works^ on evergreen browsers here <a href="https://github.com/Polymer/ShadowDOM">https://github.com/Polymer/ShadowDOM</a></p> <p><em>^ polyfilling of CSS features like @host are not in there yet, coming soon</em></p> <p>So, yes, it's a hard thing to polyfill, specifically because we have to invent secondary DOM trees. We tried to make it as user-friendly as possible, which required the use of a rather invasive wrapper technique. </p> <p>In other words, if you <code>div = document.createElement('div')</code>, you get a thing that looks like a DIV and works like a DIV, but is actually a Wrapper object. The ultimate goal of course, is for your code to look the same whether its running under the polyfill or under a native implementation.</p> <p>It's not 100% bulletproof, in particular it's not possible for us to wrap <code>document</code> for you, so you have to do that yourself, a la:</p> <pre><code>wrap(document).querySelector(...) </code></pre> <p>Other than the <code>document</code> issue, the wrappers are intended to work transparently. This is all brand new, so I apologize for the lack of docs. We are working on that as we speak.</p> <p>Please <a href="https://github.com/Polymer/ShadowDOM/issues/new">file issues</a> if you have questions or problems, we love to get feedback. There is also an email channel for discussing this polyfill (and the other polyfills in that org) at polymer-dev@googlegroups.com.</p> <blockquote> <blockquote> <p>I doubt this stuff is widely implemented </p> </blockquote> </blockquote> <p>True, but it's in Chrome at least.</p>
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    1. POTo what degree can the Shadow DOM be emulated using a polyfill?
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    1. USScott Miles
    1. USScott Miles
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    1. POTo what degree can the Shadow DOM be emulated using a polyfill?
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    1. COWow, Scott. This is amazing. I assume this would (will) be a hit were you present this att Google I/O. If Web Components can be successfully polyfilled in any shape or form on IE9/10, the browser vendor who must not be named will be forced to jump on your suggested and beautiful W3C submissions. Otherwise there are plenty of reasons and forces at work to make this another WebGL or Dart. This will make a great deal of ISVs target the web rather than the desktop for many categories of applications.
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      1. USPatricia Brothers
    2. COThe shim is very impressive...I wonder, is it a viable option for websites that need to be mobile-friendly? I'm sure there must be a performance hit involved in maintaining the shadow DOM.
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      1. USMatt Browne
    3. COYes, there is a performance cost for polyfilling shadow DOM, but we don't have any hard numbers yet. All the development is out in the open, so we will share any data we generate. The hope is that when used in concert with other technologies like Custom Elements and MDV, the usage patterns will tend to provoke the polyfill less frequently.
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      1. USScott Miles
 

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