-header-panel>
  
  <core-header-panel mode="seamed">
    <div class="core-header">seamed</div>
    <div class="content"></div>
  </core-header-panel>

  <core-header-panel mode="waterfall">
    <div class="core-header">waterfall</div>
    <div class="content"></div>
  </core-header-panel>

  <core-header-panel mode="waterfall-tall">
    <div class="core-header">waterfall-tall</div>
    <div class="content"></div>
  </core-header-panel>
  
  <core-header-panel mode="waterfall-tall" tallClass="medium-tall">
