Elements below have jQuery.data associated. Open the Toolbox (F12) Select the Inspector panel and inspect the elements below. You should see a little envelop icon ✉ for every element that has jQueryData associated
My span elementLog Data generates logs in the Console panel. You can inspect jQueryData from these logs.Change data changes jQuery.data on all span elementsRemove data clears jQuery.data on all span elementsMutate element changes an attribute on all span elementsAppend element appends new 'span' element to document.body