chromium/chrome/browser/resources/ash/settings/os_people_page/add_user_dialog.html

<style include="settings-shared">
  cr-dialog::part(dialog) {
    width: 320px;
  }
</style>
<cr-dialog id="dialog" close-text="$i18n{close}">
  <div slot="title">$i18n{addUsers}</div>
  <div slot="body">
    <cr-input id="addUserInput" label="$i18n{addUsersEmail}"
        invalid="[[shouldShowError_(errorCode_)]]"
        on-value-changed="onInput_"
        error-message="[[getErrorString_(errorCode_)]]" autofocus>
    </cr-input>
  </div>
  <div slot="button-container">
    <cr-button class="cancel-button" on-click="onCancelClick_">
      $i18n{cancel}
    </cr-button>
    <cr-button on-click="addUser_" class="action-button"
        disabled$="[[!canAddUser_(isEmail_, isEmpty_)]]">
      $i18n{add}
    </cr-button>
  </div>
</cr-dialog>