Selector for query. The "selector" attribute uses defined by w3c consortium syntax for CSS rule selector with some jQuery extensions.
should be similar to rich:hotkey docs:
The CSS selector of the DOM root from which key events should be handled. When no value provided, events are handled for whole document. ID selectors starting with hash sign (#) will be expanded from componentId to clientId form. (e.g. #component is expanded to #form:component in case that component is nested in form)