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Extend Native HTML Elements with Polymer

Extend Native HTML Elements with Polymer

3:11
Polymer allows us to extend a native HTML elements UI or functionality. In this lesson we'll use a button as our custom element basis and add new UI and functionality to it that can be added to any button in our application.
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egghead.io

Polymer allows us to extend a native HTML elements UI or functionality. In this lesson we'll use a button as our custom element basis and add new UI and functionality to it that can be added to any button in our application.

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Hack to the Future 1

i'm getting a JS warning in Firefox: "mismatched tag. Expected: ."
it all works fine but wondering about this warning?

In reply to egghead.io
HEY, QUICK QUESTION!
Joel's Head
Why are we asking?