samples/third_party/todomvc_performance/web/elements/td_item.html

<link rel="import" href="td_input.html">
<polymer-element name="td-item" extends="li" on-blur="{{commitAction}}">
  <template>
    <link rel="stylesheet" href="td_item.css">
    <div class="view {{ {'completed': item.completed, 'editing': editing} }}"
        hidden?="{{editing}}" on-dblclick="{{editAction}}">
      <input type="checkbox" class="toggle" checked="{{item.completed}}"
          on-click="{{itemChangeAction}}">
      <label>{{item.title}}</label>
      <button class="destroy" on-click="{{destroyAction}}"></button>
    </div>
    <input is="td-input" id="edit" class="edit" value="{{item.title}}"
        hidden?="{{!editing}}" on-td-input-commit="{{commitAction}}"
        on-td-input-cancel="{{cancelAction}}">
  </template>
  <script type="application/dart" src="td_item.dart"></script>
</polymer-element>