Requested feature overview description.
Allow user supplied HTML as valid content, so HTML5-based non-flash animations can be uploaded. I uploaded an example for a very basic animation with interactivity to https://mega.nz/#!FL4jEIQD!ASQcXbtwJOXOp45NWoI7CTczlLRby-1kf_j8tp7fApc .

Why would it be useful?
HTML5 animations work on all modern browsers and operating systems, including mobile devices, even those which are not supported by Adobe Flash.

What part(s) of the site page(s) are affected?
Backend would need to recognize the user-supplied HTML-file as allowed file type. For security reasons, the front-end would need to display this content in a sandboxed iframe (see https://caniuse.com/#feat=iframe-sandbox ).

I would like to see a world where one does not need Adobe Flash for sharing interactive content. Let me know what you think.

EDIT: Uploaded tech-demo to mega and ajdusted the link.