Documentation is broken/insufficient.

[indolering]

The documentation is insufficient, simple dropping the example code does not produce a working drop down menu:

<template is="auto-binding">
  <div relative>
    <core-icon-button id="trigger" icon="menu"></core-icon-button>
    <core-dropdown relatedTarget="{{$.trigger}}">
      <core-menu>
        <core-item>Cut</core-item>
        <core-item>Copy</core-item>
        <core-item>Paste</core-item>
      </core-menu>
    </core-dropdown>
  </div>
</template>

Even dropping this into the demo page and importing the required elements does not work.

The demo page seems to rely on an event handler to toggle the dropdown menu, this is not mentioned in the documentation at all.