When does document.ready() get invoked?

Question

In the below parsing phase,

When does $document.ready() get executed?

Answer 1

When does $document.ready() get executed?

.ready() can be executed multiple times

.ready( handler )
Returns: jQuery
Description: Specify a function to execute when the DOM is fully loaded.

If .ready() is called after the DOM has been initialized, the new handler passed in will be executed immediately.

The .ready() method can only be called on a jQuery object matching the current document, so the selector can be omitted.

n = -1;

function ready() {
  document.getElementsByTagName("p")[0].textContent += "ready " + ++n + "\n";
}

$(document).ready(ready);

$(document).ready(function() {
  ready();
  $(document).ready([function() {
    ready()
  },
    function() {
      $(document).ready(function() {
        ready();
        $(document).ready([
          function() {
            ready()
          }, function() {
          ready()
          if (n === 5) $(document).ready(function() {ready()})
        }]);
      
      })
    }
  ])
})

See soruce at ready.js

if ( document.readyState === "complete" ||
    ( document.readyState !== "loading" && !document.documentElement.doScroll ) ) {

    // Handle it asynchronously to allow scripts the opportunity to delay ready
    window.setTimeout( jQuery.ready );

} else {

    // Use the handy event callback
    document.addEventListener( "DOMContentLoaded", completed );

    // A fallback to window.onload, that will always work
    window.addEventListener( "load", completed );
}