anchor.diff:  @Component({
     selector: 'my-app',
     template: `
  -    <paper-scroll-header-panel fixed>
  -      <paper-toolbar [class.raised]="isInChildView">
  -        <paper-icon-button icon="arrow-back" *ngIf="isInChildView" (click)="goBack()"></paper-icon-button>
  -        <div class="title">{{title}}</div>
  -      </paper-toolbar>
  +    <app-header-layout has-scrolling-region>
  +      <app-header fixed>
  +        <app-toolbar [class.raised]="isInChildView">
  +          <paper-icon-button icon="arrow-back" *ngIf="isInChildView" (click)="goBack()"></paper-icon-button>
  +          <div title spacer>{{title}}</div>
  +        </app-toolbar>
  +      </app-header>
         <router-outlet></router-outlet>
  -    </paper-scroll-header-panel>
  +    </app-header-layout>
     `,
     styles: [`
  -    paper-scroll-header-panel {
  -      height: 100%;
  +    app-toolbar {
  +      background: var(--primary-color);
  +      color: var(--dark-theme-text-color);
       }
   
  -    paper-toolbar.raised {
  +    app-toolbar.raised {
         @apply(--shadow-elevation-4dp);
       }
   
  -    paper-toolbar paper-icon-button {
  -      margin-left: -8px;
  -      margin-right: 24px;
  -    }
  -
  -    paper-toolbar .title {
  -      margin-left: 56px;
  -    }
  -
  -    paper-toolbar paper-icon-button + .title {
  -      margin-left: 0;
  +    paper-icon-button {
  +      position: absolute;
  +      top: 12px;
  +      left: 8px;
       }
     `],
     directives: [
  
positive.code: 
      <!-- Polymer Elements -->
      <link rel="import" href="bower_components/iron-icons/iron-icons.html">
      <link rel="import" href="bower_components/paper-scroll-header-panel/paper-scroll-header-panel.html">
      <link rel="import" href="bower_components/paper-toolbar/paper-toolbar.html">
      <link rel="import" href="bower_components/paper-icon-button/paper-icon-button.html">
      <link rel="import" href="bower_components/paper-input/paper-input.html">
      <link rel="import" href="bower_components/vaadin-grid/vaadin-grid.html">
  
negative.code: paper-input
  paper-material
  paper-ripple
  paper-styles
  polymer
  vaadin-date-picker
  vaadin-grid
  