chromium/ash/webui/personalization_app/resources/js/wallpaper/local_images_element.html

<style include="wallpaper common">
  :host {
    overflow: hidden;
  }

  #main {
    height: 100%;
    overflow-y: auto;
    width: 100%;
  }

</style>
<main id="main" aria-label="$i18n{myImagesLabel}" tabindex="-1">
  <iron-list
      items="[[imagesToDisplay_]]" grid role="listbox"
      aria-setsize$="[[imagesToDisplay_.length]]">
    <template>
      <wallpaper-grid-item
          aria-label$="[[getAriaLabel_(item, imageDataLoading_)]]"
          aria-posinset$="[[getAriaIndex_(index)]]"
          data-id$="[[getImageDataId_(item)]]"
          disabled="[[isImageLoading_(item, imageDataLoading_)]]"
          index="[[index]]"
          on-wallpaper-grid-item-selected="onImageSelected_"
          role="option"
          selected="[[isImageSelected_(item, currentSelected_, pendingSelected_)]]"
          src="[[getImageData_(item, imageData_, imageDataLoading_)]]"
          tabindex$="[[tabIndex]]">
      </wallpaper-grid-item>
    </template>
  </iron-list>
</main>