title: Polymer 3 - KeyframeEffect is not defined
body: <p>Come on... I mean, how on earth do you expect people to start using Polymer if even a basic <b>paper-dropdown-menu</b> is NOT working out-of-the-box??</p>
  <p>And then I had a look on Google, and there are a lot of people complaining about this bug:</p>
  <blockquote>
  <p>KeyframeEffect is not defined</p>
  </blockquote>
  <p>And then using Bower I installed 'neon-animation' and 'web-animations-js'</p>
  <blockquote>
  <p>bower install --save PolymerElements/neon-animation</p>
  <p>bower install --save web-animations-js</p>
  </blockquote>
  <p>And then, right after the import of 'webcomponents-loader.js', I added</p>
  <blockquote>
  <p>link rel=&quot;import&quot; href=&quot;bower_components/web-animations-js/web-animations.html&quot;</p>
  </blockquote>
  <p>Or any of the other ' web-animations*.* '</p>
  <p>And the thing is still <b>NOT</b> working!!!</p>
  <p>I mean, guys, am I suppose to develop with Polymer and make <em>awesome</em> web app??</p>
  <p>It's a bloody hell!</p>
  <p>Come on...</p>