I noticed &_v= in js files url is not escaped as &, found that while running html validation tests
XenForo_Template_Abstract, Line #477
	
	
	
		
Should be
	
	
	
		
				
			XenForo_Template_Abstract, Line #477
		PHP:
	
	$file = $file . (strpos($file, '?') ? '&' : '?') . '_v=' . XenForo_Application::$jsVersion;
		PHP:
	
	$file = $file . (strpos($file, '?') ? '&' : '?') . '_v=' . XenForo_Application::$jsVersion;