Re: [w3c/webcomponents] The is="" attribute is confusing? Maybe we should encourage only ES6 class-based extension. (#509)

@oleersoy The approach I suggested will work with Polymer's app-drawer. Just use CSS to make the app-drawer show its contents before it's upgraded and remove those styles if Polymer is available. You can probably get more specific and helpful answers about a particular Polymer element if you open an issue on that element's repository.

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