React custom element boilerplate

Try it with pressure-sensitive tablet or phone. It's fun!

<!-- Custom Elements v1 polyfill (2.7KB gzipped) -->
<script src="https://unpkg.com/@webcomponents/[email protected]"></script>

<!-- Our custom element's source -->
<script src="https://unpkg.com/[email protected]"></script>

<element-easel stroke="red" stroke-width="5">
  <div>
    My stuff
  </div>
</element-easel>