While working on jquery/jquery-migrate#291 the tests failed indicating that we are using jQuery.cssProps still in a somewhat insidious way. Each time someone accesses a CSS property we're populating it with properties like { width: "width" }. That makes it hard for Migrate to warn since just about anything can end up there through no fault of external code. For now I won't land this warning and leave jquery/jquery-migrate#283 open until we can change the logic to only populate jQuery.cssProps when it needs to actually change the property name.