Browser support

Windows 10

 ProbablyMaybeSupports Dolby Atmos
Microsoft Edge True True
Chrome 54 False True
Firefox 47 No False
Internet Explorer 11 False True

macOS Sierra

 ProbablyMaybeSupports Dolby Audio
Safari 10+ True True
Safari 8* True True
Chrome 54 False False
Firefox 49 True False

* Safari 8 falsely reports it can play Dolby.

iOS 11

 ProbablyMaybeSupports Dolby Audio
Safari 9+ True True
Chrome 48 Maybe False

Fire OS

 ProbablyMaybeSupports Dolby Audio
Amazon Silk True True