getElementsByClassName method
The getElementsByClassName method of
Document interface returns an array-like object
of all child elements which have all of the given class name(s).
When called on the document object, the complete document is searched, including the root node. You may also call Element.getElementsByClassName on any element; it will return only elements which are descendants of the specified root element with the given class name(s).
Warning: This is a live HTMLCollection. Changes in the DOM will reflect in the array as the changes occur. If an element selected by this array no longer qualifies for the selector, it will automatically be removed. Be aware of this for iteration purposes.
Implementation
external HTMLCollection getElementsByClassName(String classNames);