Nearly perfect. Thanks!

57.0b13 (64-bit) + Kodi 17.5. Works on Chrome, but not here. Opened an issue at https://github.com/goldenratio/xbmc-web-remote/issues/43 with detailed and useful debug info, but author closed it with "unable to reproduce". Thanks for nothing. If you read this, I'm a > 15 years experienced linux sysadmin, so I know what I'm talking about. I have 2 osmc installs at home, and both of them work under Chrome.