Scene background color transparency wasn’t really supported, and it was a bug that the color picker panel showed the alpha value. This has been removed in Hype v3.6+.
So if I understand this correctly I will not be able to have transparent backgrounds anymore? That would be a sad thing. Because it did work, but only in a buggy way.
Though to clarify the “Make background transparent” option works just fine, this is only about scene background color values; depending on your document, you may want to use this option. It may also be possible to use CSS to override the scene background color.
Set the background to a unique color and copy the Hex value. ie #797979
Export your project.
Open up the hype_generated_script.js file.
Search the file for your unique Hex value. (#797979)
Change the value to #00FFF. (should look like this: c:"#00FFF")
Hit save.
Open your html file in a browser to see the result.
Light a cigar and pour your self a drink…and you’re done.
This works when using the html file…
I needed to use the scene as an element to be dropped into an app by another Dev team so I wanted to work with no html file or additional css.
I was going to chime in about this, but as you replied right below my post with this line I figured you had different needs!
Note that this is just for the scenes; there are some cases where folks have needed the HTML itself to be transparent (say embedding into another app) and that would require body CSS.