iiucandyfloss wrote:

That's very odd. The filter usually doesn't filter links as they might be used to ask to add something to a studio, or advertise where advertising is allowed.

Here is a way to rephrase your comment. I've commented the following rephrasal on one of my projects, but it didn't get filtered. Of course, it might be because I wasn't replying to anyone else's comment.
You can use JavaScript coding, or you can ask for one here: https://scratch.mit.edu/discuss/topic/729279/
The link is to my scratch shop, the Mockup Market. There is a guide in the requests forum which tells you what shops are.
You can't really use JavaScript for mockups instead of HTML… Does it work if I cut that part out?