/**
* I handle a click event from within the host.
*/
function handleClick( event ) {

	if ( isEventModified( event ) ) {

		return;

	}

	var anchor = getAnchorFromEvent( event );

	if ( ! anchor || isAnchorExternal( anchor ) ) {

		return;

	}

	event.preventDefault();

	// Update the URL to reflect the anchor HREF; but, don't navigate the page.
	window.history.pushState(
		{
			xHandler: xHandler,
			xID: xID,
			href: anchor.href
		},
		null,
		anchor.href
	);

	// Implement the "navigation" content swap using AJAX.
	processHref( anchor.href );

}