MediaWiki:Apihelp-query+imageinfo-param-urlparam
From MoodleDocs
A handler specific parameter string. For example, PDFs might use page15-100px. $1urlwidth must be used and be consistent with $1urlparam.
Note: You are currently viewing documentation for Moodle 3.1. Up-to-date documentation for the latest stable version of Moodle is probably available here: Apihelp-query+imageinfo-param-urlparam.
