这是模块:If preview的文档页面
 | This Lua module is used on many pages and changes may be widely noticed. Test changes in the module's /sandbox or /testcases subpages, or in your own module sandbox. Consider discussing changes on the talk page before implementing them. |
 | This module depends on the following other modules: |
Lua错误 在模块:TNT的第167行：Missing Commons dataset I18n/Module:TNT.tab
This module implements {{If preview}} and {{Preview warning}}. It helps templates/modules determine if they are being previewed.
Prefer implementing the template versions in other templates.
In a module to use the main(), you need to pass a frame table with an args table.
For the preview warning, use _warning().