[subv3rsion]

An HTMLCollection in the HTML DOM is live; it is automatically updated when the underlying document is changed.

[lollipop24]

A good example of a "dead collection" is the NodeList returned by `querySelectorAll` http://jsfiddle.net/4jyv99o6/14/

[subv3rsion]

Using jQuery is a good example of comparing the behavior of HTMLCollection to a jQuery object http://jsfiddle.net/m3xzdg71/.