HTMLCollection.item()
gets an element by position.
The Node
at the specified index, or null if index is less than zero or greater than or equal to the length property.
The item( ) method returns a numbered element from an HTMLCollection. In JavaScript, it is easier to treat the HTMLCollection as an array and to index it using array notation.
var c = document.images; // This is an HTMLCollection var img0 = c.item(0); // You can use the item( ) method this way var img1 = c[1]; // But this notation is easier and more common
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https://developer.mozilla.org/en-US/docs/Web/API/HTMLCollection/item