I get the below when I open the Customizer window and then inspect:
JQMIGRATE: Migrate is installed, version 1.4.1
[Deprecation] Resource requests whose URLs contain raw newline characters are deprecated, and may be blocked in M60, around August 2017. Please remove newlines from places like element attribute values in order to continue loading those resources. See https://www.chromestatus.com/features/5735596811091968 for more details.
jquery-migrate.min.js?ver=1.4.1:2 JQMIGRATE: Migrate is installed, version 1.4.1
?customize_changeset_uuid=f3a954e3-dfc4-4049-bab7-cad68af44747&customize_theme=forefront&customize_…:92 The value “1080px” for key “width” was truncated to its numeric prefix.
Right clicking in the customizer window and then inspect does not produce any red errors.