  <paper-item>Item 1</paper-item>
      <paper-item>Item 2</paper-item>
    </paper-menu>

An initial selection can be specified with the `selected` attribute.

    <paper-menu selected="0">
      <paper-item>Item 1</paper-item>
      <paper-item>Item 2</paper-item>
    </paper-menu>

Make a multi-select menu with the `multi` attribute. Items in a multi-select menu can be deselected,
and multiple items can be selected.

    <paper-menu multi>
      <paper-item>Item 1</paper-item>
      <paper-item>Item 2</p