chrome/browser/resources/ash/print_preview/ui/app.html

<style>
  :host {
    display: flex;
    height: 100%;
    user-select: none;
  }

  @media (prefers-color-scheme: dark) {
    :host {
      background: var(--google-grey-900);
    }
  }

  print-preview-sidebar {
    flex: none;
    width: var(--print-preview-sidebar-width);
  }

  #preview-area-container {
    align-items: center;
    background-color: var(--preview-area-background-color);
    flex: 1;
  }
</style>
<print-preview-state id="state" state="{{state}}" error="{{error_}}">
</print-preview-state>
<print-preview-model id="model" settings="{{settings}}"
    settings-managed="{{settingsManaged_}}" destination="[[destination_]]"
    document-settings="[[documentSettings_]]"
    margins="[[margins_]]" page-size="[[pageSize_]]"
    max-sheets="{{maxSheets_}}"
    on-preview-setting-changed="onPreviewSettingChanged_"
    on-sticky-setting-changed="onStickySettingChanged_"
    on-setting-valid-changed="onSettingValidChanged_">
</print-preview-model>
<print-preview-document-info id="documentInfo"
    document-settings="{{documentSettings_}}" margins="{{margins_}}"
    page-size="{{pageSize_}}">
</print-preview-document-info>
<div id="preview-area-container">
  <print-preview-preview-area id="previewArea" settings="[[settings]]"
      destination="[[destination_]]" error="{{error_}}"
      document-modifiable="[[documentSettings_.isModifiable]]"
      margins="[[margins_]]" page-size="[[pageSize_]]" state="[[state]]"
      measurement-system="[[measurementSystem_]]"
      preview-state="{{previewState_}}" on-preview-start="onPreviewStart_">
  </print-preview-preview-area>
</div>
<print-preview-sidebar id="sidebar"
    destination-state="{{destinationState_}}"
    controls-managed="[[controlsManaged_]]" destination="{{destination_}}"
    error="{{error_}}" is-pdf="[[!documentSettings_.isModifiable]]"
    page-count="[[documentSettings_.pageCount]]"
    settings="[[settings]]" state="[[state]]"
    max-sheets="[[maxSheets_]]" on-focus="onSidebarFocus_"
<if expr="is_macosx">
    on-open-pdf-in-preview="onOpenPdfInPreview_"
</if>
<if expr="not is_chromeos">
    on-print-with-system-dialog="onPrintWithSystemDialog_"
</if>
    on-print-requested="onPrintRequested_"
    on-cancel-requested="onCancelRequested_">
</print-preview-sidebar>