chromium/ash/webui/common/resources/bluetooth/bluetooth_icon.html

<style include="cr-shared-style">
  #image {
    height: 24px;
    width: 24px;
  }
</style>

<template is="dom-if" if="[[!hasDefaultImage_(device.*)]]">
  <iron-icon id="deviceTypeIcon" icon="bluetooth:[[getIcon_(device.*)]]">
  </iron-icon>
</template>
<template is="dom-if" if="[[hasDefaultImage_(device.*)]]">
  <img id="image" src="[[getDefaultImageSrc_(device.*)]]" alt="Default device image">
</template>