Templates using unnamed parameters break when those parameters contain:

• An external link that has an equal sign (example: http://example.com/?p=1)
• An HTML attribute (example: <span title="Tooltip">Text</span>)

This is because the parser interprets the equal sign as the separator between the parameter name and the value, taking precedence over those elements.

The current workaround is to use index-named parameters, changing {{template|param1|param2}} to {{template|1=param1|2=param2}}

Original report:

See http://test.wikipedia.org/wiki/Template:Warn/tests and its source. It appears that when the parameter contains a link with "=" character in its URL, the parmater is totally missed! However, if "1=" is added to the beginning of the parameter to make the template understand it, things are better.

Missing comments

All comments on this task are missing due to T284397. Comments before 2015 can be read on the old bugzilla instance