The HTMLTableElement.createTFoot() method returns the <tfoot> element associated with the table, of type HTMLTableSectionElement. If there is no footer for this table, this methods creates it, then returns it.
HTMLTableElement = table.createTFoot()
myfoot = mytable.createTFoot(); //checking: myfoot == mytable.tFoot
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https://developer.mozilla.org/en-US/docs/Web/API/HTMLTableElement/createTFoot