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<link rel=“import” href=“../app-scroll-effects-behavior.html”>
<script>
/** * Toggles the shadow property in app-header when content is scrolled to create a sense of depth * between the element and the content underneath. */ Polymer.AppLayout.registerEffect('waterfall', { /** * @this Polymer.AppLayout.ElementWithBackground */ run: function run() { this.shadow = this.isOnScreen() && this.isContentBelow(); } });
</script>