Returns an element or a collection of elements from the current collection by name or index.
Required. A string or a zero-based integer that specifies the element or elements to retrieve.
If an integer value is specified, it specifies the index of the element to retrieve.
If this parameter is a string, then it specifies a value for the name or id property of the element or elements to retrieve.
Firefox does not support string values.
Optional. Supported by Internet Explorer only.
If more than one matching element is found for the index parameter (possible only if it is a string), the item method creates a cells sub-collection filled with the matching elements.
In that case, the subIndex property specifies the position of the element in the sub-collection to retrieve.
In other cases, the subIndex property has no meaning.
If no match is found, it returns null in Internet Explorer, Firefox and Opera, and returns undefined in Google Chrome and Safari.
If exactly one match is found, it returns the matching td or th element.
If more than one match is found, it returns a cells sub-collection filled with the matching elements.
The sub-collection contains the matching elements in source order.