View designer.html
<link href="../core-icon-button/core-icon-button.html" rel="import">
<link href="../core-toolbar/core-toolbar.html" rel="import">
<link href="../core-header-panel/core-header-panel.html" rel="import">
<link href="../paper-input/paper-input.html" rel="import">
<polymer-element name="my-element">
<template>
<style>
#core_header_panel {