Question: Do BTT's HTML Popup Menus support CSS3 Backdrop Filters?
Them translucency blurs would be nice to have in my AQT3 help windows...
Hey,
no, backdrop filters can only blur to the back of the website itself, not to any content behind the window as far as I know. (So if you have a image as background that could be blurred)
In general it supports everything that's supported in Safari 
Ah, I did play with it but it didn't work to the contents behind it... 
Aw it would've looked so good.. oh well!
While I'm here, I'd just like to quickly mention: