! colspan=2 id="C headerbar" style="background: #F8eabA; text-align: center;" |
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 | This is the template sandbox page for Template:Chembox headerbar (diff). |
 | This template is used on approximately 15,000 pages and changes may be widely noticed. Test changes in the template's /sandbox or /testcases subpages, or in your own user subpage. Consider discussing changes on the talk page before implementing them. |
Usage
edit|header=Identifiers (header text)
|addcats= allows adding a maintenance category. Usually checks a condition. Will only work in mainspace.
|addcats = {{#if:{{{OldParameter|}}}|[[Category:Bad parameter used]]}}