chromium/chrome/browser/resources/extensions/pack_dialog.html

<style include="cr-shared-style">
  cr-input {
    margin-top: var(--cr-form-field-bottom-spacing);
    --cr-input-error-display: none;
  }

  cr-button[slot='suffix'] {
    margin-inline-start: 10px;
  }

  /* Prevent focus-outline from being chopped by bottom of dialog body. */
  cr-input {
    margin-bottom: 4px;
  }
</style>
<cr-dialog id="dialog" close-text="$i18n{close}">
  <div slot="title">$i18n{packDialogTitle}</div>
  <div slot="body">
    <div>$i18n{packDialogContent}</div>
    <cr-input id="rootDir" label="$i18n{packDialogExtensionRoot}"
        value="{{packDirectory_}}" autofocus>
      <cr-button id="rootDirBrowse" on-click="onRootBrowse_"
          slot="suffix">
        $i18n{packDialogBrowse}
      </cr-button>
    </cr-input>
    <cr-input id="keyFile" label="$i18n{packDialogKeyFile}"
        value="{{keyFile_}}">
      <cr-button id="keyFileBrowse" on-click="onKeyBrowse_"
          slot="suffix">
        $i18n{packDialogBrowse}
      </cr-button>
    </cr-input>
  </div>
  <div slot="button-container">
    <cr-button class="cancel-button" on-click="onCancelClick_">
      $i18n{cancel}
    </cr-button>
    <cr-button class="action-button" on-click="onConfirmClick_"
        disabled="[[!packDirectory_]]">
      $i18n{packDialogConfirm}
    </cr-button>
  </div>
</cr-dialog>
<template is="dom-if" if="[[lastResponse_]]" restamp>
  <extensions-pack-dialog-alert model="[[lastResponse_]]"
      on-close="onAlertClose_">
  </extensions-pack-dialog-alert>
</template>