We only get this warning when using Resizer - when we disable it, the warning goes away.
Here is the full warning: [Deprecation] Styling master document from stylesheets defined in HTML Imports is deprecated, and is planned to be removed in M65, around March 2018. Please refer to https://goo.gl/EGXzpw for possible migration paths.
Are you working on a fix for this?
Сервис поддержки клиентов работает на платформе UserEcho