String mode
read / write

Controls header and scrolling behavior. Options are standard, seamed, waterfall, waterfall-tall, scroll and cover. Default is standard.

standard: The header is a step above the panel. The header will consume the panel at the point of entry, preventing it from passing through to the opposite side.

seamed: The header is presented as seamed with the panel.

waterfall: Similar to standard mode, but header is initially presented as seamed with panel, but then separates to form the step.

waterfall-tall: The header is initially taller (tall class is added to the header). As the user scrolls, the header separates (forming an edge) while condensing (tall class is removed from the header).

scroll: The header keeps its seam with the panel, and is pushed off screen.

cover: The panel covers the whole paper-header-panel including the header. This allows user to style the panel in such a way that the panel is partially covering the header.

<paper-header-panel mode="cover">
  <paper-toolbar class="tall">
    <core-icon-button icon="menu"></core-icon-button>
  </paper-toolbar>
  <div class="content"></div>
</paper-header-panel>