Internet Explorer 8 displayed a bogus mixed content security warning when the src attribute was set to javascript:void(0).
See for example https://jira.atlassian.com/browse/CONFSERVER-15590 or https://blog.httpwatch.com/2009/09/17/even-more-problems-with-the-ie-8-mixed-content-warning/
This reverts rP34db006c4b6cc5f7627d582ded3001168f75ca68