[jQuery] dimensions plugin: relativeTo not working?

[Codex]

Or am I trying to set it the wrong way?

var getOffset = $(icon).offset({relativeTo: '#col-left' });

Also tried the variants:

var getOffset = $(icon).offset({relativeTo: 'col-left' });
var getOffset = $(icon).offset({relativeTo: ('col-left') });

but I keep getting the same result, and that is the offset relative to
the body. Am I missing something?