Why: Only Secure Content is Displayed Internet Explorer 11
You may receive a warning message in Internet Explorer 11 while browsing a secure (SSL) website.
This message is telling you that there may be both secure and non-secure content on the page. Secure and non-secure content, or mixed content, means that a webpage is trying to display elements using both secure (HTTPS/SSL) and non-secure (HTTP) web server connections. This often happens with online stores or financial sites that display images, banners, or scripts that are coming from a server that is not secured. The risk of displaying mixed content is that a non-secure webpage or script might be able to access information from the secure content.
Learn more on Microsoft’s Website here.