An HTMLCollection is an array-like object that represents a collection of elements from the DOM. Typically it is used to store a group of elements that have the same tag name, and provides methods for accessing and manipulating those elements. HTMLCollections are live. Changes made to the DOM are immediately reflected in the collection, and can be accessed using numeric indexes or named properties corresponding to the element IDs.
A NodeList is an array-like object that represents a collection of nodes from the DOM. It is typically used to store a group of nodes that have been selected, and provides methods for accesssing and manipulating those nodes. NodeLists are also live, meaning that changes made to the DOM are immediately reflected in the list, and can be accessed using numeric indexes or properties corresponding to the node IDs.
HTMLCollection and NodeList are similar because they're both array-like objects that represent collections of nodes or elements from the DOM. They're both live and can be accessed using numeric indexes, and both have a length property that specifies the number of nodes or elements in the collection. However, they're different in certain ways. HTMLCollections are specific to elements, while NodeLists contain non-element nodes such as text and comment nodes. Also, HTMLCollections have a named property for each element's ID, NodeList doesn't.
HTMLCollection and NodeList are both array-like objects that represent collections of nodes or elements from the DOM. They are both live collections, and update when the DOM changes. HTMLCollection is specific to elements and provides a named property for each elements ID, while NodeList can contain non-element nodes such as text and comment nodes. Both can be accesssed using numeric indexes and have a length property.