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HTMLCollection: item() method - Web APIs | MDN
index
The position of the Element
to be returned. Elements appear in an
HTMLCollection
in the same order in which they appear in the document's
source.
The Element
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. See the
example below.
const images = document.images; // This is an HTMLCollection
const img0 = images.item(0); // You can use the item() method this way
const img1 = images[1]; // But this notation is easier and more common