Autocomplete - not working in Android mobile browser

(Sorry if I've missed something or if this is a browser-specific issue not fixable in Codemirror!)

In http://codemirror.net/demo/xmlcomplete.html (for example), '<' triggers autocomplete on iOS Safari and desktop Chrome but does not display anything on mobile Chrome on Android.

Working on iOS (Safari on iOS 11.2):

Not doing anything on mobile Chrome on Android (63.0.3239.111 on Android 7.0.0):

I'd really appreciate any help with this issue.