SCRIPT87: Invalid argument.
spin.js?ver=1.2.4, line 43 character 3
(jquery spin enqueued with the notes-rest-common.js file)
SCRIPT1003: Expected ':'
notes-rest-common.js?ver=2.0-201246, line 87 character 345
(seems this is a @todo comment, if so interesting it causes a syntax error in IE!)
SCRIPT5009: 'Spinner' is undefined
jquery.spin.js?ver=3.4.2, line 27 character 3
(statement is just if ( Spinner ) rather than something like if ( typeof Spinner !== 'undefined' ) )
Though I'm not seeing anything specific to the site I'm testing it on, and no errors in both Firefox and Chrome.