On 6/30/14, Adam Wight awight@wikimedia.org wrote:
Hi, Fundraising would like the ability to snapshot or retrieve a CentralNotice banner exactly as it was rendered at an earlier time, including the old revisions of templates, which is tricky and AFAICT not supported by MediaWiki-core.
Exact is hard. CSS changes, javascript changes, central notice extension changes, etc.
But if you want to just implement this just in central notice in a limited way, take a look at BeforeParserFetchTemplateAndtitle hook, the setTemplateCallback method of ParserOptions, and the BeforeParserFetchFileAndTitle hook (The $options array for that hook can set a time and sha1 key).
--bawolff