Some MediaWiki installations have images hosted on a different domain than the wiki, and in some cases do not have an 'Access-Control-Allow-Origin' header on the image server domain. This causes the XMLHttpRequest for MultimediaViewer to fail, and nothing but a black screen appears. So that the usability isn't completely broken in these (and similar) situations, if the XMLHttpRequest to get the image fails for any reason, MultimediaViewer should fall back to simply displaying the image using an <img> tag.
Version: unspecified
Severity: major