V
valueOf( ) method, 145 “146
var keyword, 28 “29, 47 “48, 69
var object, HTMLElement, 902 “903
variable scope
event handlers and, 72 “73
execution context and, 73 “74
functions and, 70 “72
overview of, 70
variables
combining operators with, 35
conditional compilation, 649
debuggers watching, 706
declaring, 47 “48, 69 “70
execution, 73 “74
identifiers, 47, 67 “69
mask outs, 119 “120
overview of, 28 “29, 47 “48
scope, 70 “73
static, 124 “125
types of, 47
values, 47
vectors, 62. See also arrays
version detection, JavaScript, 541 “542
visibility property, CSS, 511
visual (Screen object), browser detection, 544 “548