Stopped working on iOS 10

[IntrepidPig]

The playground no longer shows up for me when I visit it in Safari or Firefox on iOS 10. All I see is the light brown background. iOS 10 is a fairly old version and it's reasonable to not support it, but I though I'd let you know in case it affects other iOS versions or is an easy fix.

[shepmaster]

Hmm. This certainly wasn't super intentional, but it is following the Rust recommended guidelines for browser compatibility. Is there something preventing you from upgrading to iOS 11?