Index[SYMBOL] [A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M] [N] [O] [P] [R] [S] [T] [U] [V] [W] [X] [Z] object serialization JSON object-oriented programming (OOP) 2nd 3rd abstract classes class inheritance interfaces namespaces online tutorial, JavaScript OOP capabilities _onkeydown() method onreadystatechange property (XMLHttpRequest) opacity of an element, changing OpacityBehavior open() method (XMLHttpRequest) operators, JavaScript typeof or operator |