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At the moment to make dynamic top offset calculator on multiple elements, one would write: ``` javascript $('.my-affix').each(function () { var $el = $(this); $el.affix({ offset: { top: function () { return $el.offset().top; } } }); }) ``` This patch will allow to: ``` javascript $('.my-affix').affix({ offset: { top: function ($el) { return $el.offset().top; } } }); ```