file changes for the fallback of jQuery

client side:

<!--[if !IE]><script defer type="text/javascript" src="{T_JQUERY_LINK}" onerror="location.href = (location.href.indexOf('?') !== -1) ? location.href.replace(/\?/, '?altjQuery&') : (location.href.indexOf('#') === -1 ? location.href + '?altjQuery': location.href.replace(/#/, '?altjQuery#'));" ></script><![endif]-->
<!--[if IE]><script type="text/javascript" src="{T_JQUERY_LINK}" onerror="location.href = (location.href.indexOf('?') !== -1) ? location.href.replace(/\?/, '?altjQuery&') : (location.href.indexOf('#') === -1 ? location.href + '?altjQuery': location.href.replace(/#/, '?altjQuery#'));" ></script>
<!--[if lt IE 9]><script defer type="text/javascript" src="{T_TEMPLATE_PATH}/isjQueryHere.js"></script><![endif]--><![endif]-->
<script defer type="text/javascript" src="{T_ASSETS_PATH}/javascript/core.js"></script>
<script defer type="text/javascript" src="{T_TEMPLATE_PATH}/ajax.js"></script>
<!-- the rest of javascript files with the defer. As long as it is same origin all is ok -->

functions.php

1st: functions.php
After the 1st if in append_sid().

if($request->is_set('altjQuery'))
	{
		if(is_array($params))
		{
			$params['altjQuery'];
		}
		else if(is_string($params))
		{
			$params .= ($is_amp? '&' : '&') . 'altjQuery';
		}
		else
		{
			$params = array( 'altjQuery' => 1);
		}
	}

2nd add:
!$request->is_set('altjQuery')
in:
'T_JQUERY_LINK'			=> ($config['load_jquery_cdn'] && !empty($config['load_jquery_url'])) ? $config['load_jquery_url'] : "{$web_path}assets/javascript/jquery.js",
like this:
'T_JQUERY_LINK'			=> ($config['load_jquery_cdn'] && !empty($config['load_jquery_url']) && !$request->is_set('altjQuery') ) ? $config['load_jquery_url'] : "{$web_path}assets/javascript/jquery.js",