Question

If I use the $(document).ready() handler from within a function, will it still guarantee that the code inside it will only be run if the document is ready, even if the document ready event has occurred well in the past?

Answer 1

Yes.

From the jQuery ready function source.

// Catch cases where $(document).ready() is called after the
// browser event has already occurred.
if ( document.readyState === "complete" ) {
    // Handle it asynchronously to allow scripts the opportunity to delay ready
    return setTimeout( jQuery.ready, 1 );
}