jquery.footHovzer.js
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jquery.footHovzer.js
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	/**
	* @private
	*/
	( function () {
	let $hovzer, footHovzer = null, $spacer;

	function getHovzer() {
	if ( $hovzer === undefined ) {
	$hovzer = $( '<div>' ).attr( 'id', 'jquery-foot-hovzer' ).appendTo( document.body );
	}
	return $hovzer;
	}

	/**
	* Utility to stack stuff in an overlay fixed on the bottom of the page.
	*
	* @example
	* var hovzer = $.getFootHovzer();
	* hovzer.$.append( $myCollection );
	* hovzer.update();
	*
	* @private
	* @static
	* @inheritable
	* @return {jQuery.footHovzer}
	*/
	$.getFootHovzer = function () {
	footHovzer.$ = getHovzer();
	return footHovzer;
	};

	/**
	* @private
	* @class jQuery.footHovzer
	*/
	footHovzer = {

	/**
	* @property {jQuery} $ The stack container
	*/

	/**
	* Update dimensions of stack to account for changes in the subtree.
	*/
	update: function () {
	const $body = $( document.body );

	if ( $spacer === undefined ) {
	$spacer = $( '<div>' ).attr( 'id', 'jquery-foot-hovzer-spacer' );
	$spacer.appendTo( $body );
	}
	// Ensure CSS is applied by browser before using .outerHeight()
	setTimeout( () => {
	$spacer.css( 'height', getHovzer().outerHeight( /* includeMargin = */ true ) );
	}, 0 );
	}
	};

	/**
	* @class jQuery
	* @mixes jQuery.plugin.footHovzer
	*/

	}() );