eBay Active Content
Here is how eBay explains the term:
This type of content in eBay listings may inhibit purchase on mobile devices and can lead to abuse in our marketplace. We recommend you don’t use active content in your listings and, as announced in our autumn 2016 Business Seller News, from June 2017, we’ll limit the use of active content in all new listings across all devices and it will not appear by default. Later in 2017, we plan to remove or block listings with active content.
To prepare for these changes, we encourage you to stop using active content now. You can check if your listings contain active content by using the i-ways Checker, a free tool which has been developed in collaboration with us.
Learn more about 'Active Content'
Please refer to this eBay help article to learn more about 'Active Content' http://sellercentre.ebay.co.uk/business/active-content#whatis.