$(""), $(null), $(undefined), $(false)
$(expr, context)
(which is just equivalent to: $(context).find(expr)
$(function)
Shortcut for document ready
[ owner, key, value ] args
Always use camelCase key (gh-2257)
[ owner, { properties } ] args
regular nodes (via `this.ownerDocument`), window
(via `this.document`) & document (via `this`).
protocol always yields status 0; see #8605, #14207