Bootstrap 2.0 dropdown multi-level menu enabler

bootstrap-dropdown-hack.css

/**
 * Bootstrap 2.0 dropdown multi-level menu enabler
 * Bootstrap: http://twitter.github.com/bootstrap/javascript.html#dropdowns
 *
 * Bootstrap 2.1 add submenu support, don't use this
 */
/* overrides */
.open .dropdown-toggle,.dropdown.open .dropdown-toggle{color: #666;}
.open .dropdown-menu,.dropdown.open .dropdown-menu{display:none;}

.open > .dropdown-menu,.dropdown.open > .dropdown-menu{display:block;}

.open .dropdown-menu > .dropdown:hover > .dropdown-menu,
.dropdown.open .dropdown-menu > .dropdown:hover > .dropdown-menu{
	display:block;
}

.dropdown-menu > .dropdown > .dropdown-menu {
	top: 0px;
}

.dropdown-menu > .dropdown > .dropdown-toggle:hover {
	color:#fff;
	background-color: #0088cc;
}

.dropdown-menu > .dropdown > .dropdown-toggle {
  background: none;
}

.dropdown-menu > .dropdown.offset-left > .dropdown-menu {
	left: -100%;
}

.dropdown-menu > .dropdown.offset-right > .dropdown-menu {
	left: 100%;
}

.dropdown-menu > .dropdown.offset-left > .dropdown-menu:before,
.dropdown-menu > .dropdown.offset-right > .dropdown-menu:before, 
.dropdown-menu > .dropdown.offset-left > .dropdown-menu:after,
.dropdown-menu > .dropdown.offset-right > .dropdown-menu:after {
  content: '';
  display: inline-block;
  border: 0;
  position: absolute;
}

Hi i was just wondering when does the open class get appended to your css? It doesn't seem to happen as a function of the drop down click?

@thomen: bootstrap handle it