chromium/chrome/browser/resources/settings/site_settings/add_site_dialog.html

    <style include="settings-shared">
      #incognito {
        padding-bottom: 10px;
      }
    </style>
    <cr-dialog id="dialog" close-text="$i18n{close}">
      <div slot="title">$i18n{addSiteTitle}</div>
      <div slot="body">
        <cr-input id="site" label="$i18n{addSite}"
            placeholder="$i18n{addSiteExceptionPlaceholder}"
            value="{{site_}}" on-input="validate_"
            error-message="{{errorMessage_}}" spellcheck="false"
            autofocus></cr-input>
        <cr-checkbox id="incognito"
            hidden$="[[!showIncognitoSessionOnly_(hasIncognito,
                contentSetting)]]">
          $i18n{incognitoSiteOnly}
        </cr-checkbox>
      </div>
      <div slot="button-container">
        <cr-button class="cancel-button" on-click="onCancelClick_">
          $i18n{cancel}
        </cr-button>
        <cr-button class="action-button" id="add" on-click="onSubmit_"
            disabled>
          $i18n{add}
        </cr-button>
      </div>
    </cr-dialog>