Originally Posted by Oxford-eBooks
I'd have thought that a SENSIBLE strategy would have been to ignore any media queries that aren't understood. So @media amzn-mobi or @media some-brand-new-device would just be ignored on ADE as they probably just wouldn't apply. Otherwise, how could it be future-proof?
It is a known problem with ADE. If you feed it a CSS that has bad statements or statements it does not understand it will ignore the whole file.