I have a Snap! mod hosted at Starbox614 github, and I want to use it for a custom embed on my website, but when I tried to use Embed mode it did this:
Works for me
#run:https://starbox614.github.io/snapprojects/JStester.xml&noExitWarning&hideControls
#run:https://starbox614.github.io/snapprojects/JStester.xml&noExitWarning&embedMode
Ok, I guess I needed to use #run instead of #open.
¯\_(ツ)_/¯
?