catapult/third_party/polymer/components/iron-a11y-keys-behavior/demo/x-key-aware.html

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<link rel="import" href="../../polymer/polymer.html">
<link rel="import" href="../../paper-styles/color.html">
<link rel="import" href="../iron-a11y-keys-behavior.html">

<dom-module id="x-key-aware">
  <style>
    :host {
      display: block;
      position: relative;
    }

    pre {
      color: var(--google-blue-700);
    }

    .keys {
      line-height: 25px;
    }

    .keys span {
      cursor: default;
      background-color: var(--google-grey-100);
      border: 1px solid var(--google-grey-300);
      padding: 1px 5px;
      border-radius: 5px;
    }
  </style>
  <template>
    <h4>Press any of these keys</h4>
    <input type="checkbox" checked="{{preventDefault::change}}"> prevent default = {{preventDefault}}
    <p class="keys">
      <template is="dom-repeat" items="[[boundKeys]]">
        <span>{{item}}</span>
      </template>
    </p>
    <pre>[[pressed]]</pre>
  </template>
</dom-module>

<script>
  Polymer({
    is: 'x-key-aware',

    behaviors: [
      Polymer.IronA11yKeysBehavior
    ],

    properties: {
      pressed: {
        type: String,
        readOnly: true,
        value: ''
      },

      boundKeys: {
        type: Array,
        value: function() {
          return Object.keys(this.keyBindings).join(' ').split(' ');
        }
      },

      preventDefault: {
        type: Boolean,
        value: true,
        notify: true
      },

      keyEventTarget: {
        type: Object,
        value: function() {
          return document.body;
        }
      }
    },

    keyBindings: {
      '* pageup pagedown left right down up home end space enter @ ~ " $ ? ! \\ + : # backspace': '_updatePressed',
      'a': '_updatePressed',
      'shift+a alt+a': '_updatePressed',
      'shift+tab shift+space': '_updatePressed'
    },

    _updatePressed: function(event) {
      console.log(event.detail);

      if (this.preventDefault) {
        event.preventDefault();
      }
      this._setPressed(
        this.pressed + event.detail.combo + ' pressed!\n'
      );
    }
  });
</script>