If you are not sure if the website you want to visit is safe, you can check it out here. Enter the address (url) of the website and see the invisible elements, such as a header or meta data.
site address:howidoit.ning.com/xn_resources/widgets/index/gfx/jstrk_off.gi...
URL does not point to a web page (html/xhtml) or read error or page not found. (404)

Header

HTTP/1.1 404 Not Found
Server nginx/1.12.1
Date Fri, 14 Dec 2018 16:53:24 GMT
Content-Length 0
Connection keep-alive
Expires Thu, 01 Jan 1970 00:00:00 GMT
Set-Cookie xn_visitor=4382983a-be6f-420a-9ca8-92adeaf25dcd;Path=/;Domain=.ning.com;Expires=Mon, 11-Dec-28 16:53:24 GMT
Set-Cookie ning_session=rt/jQdvFxKGFNkYVqiFIKoRsdvArzazwCjdE9EDhcj/3vkkCaqTKM6PSO3QWq50CI5EWvvdT/6A=;Path=/;Domain=.ning.com;Expires=Fri, 14-Dec-18 17:53:24 GMT
X-XN-Trace-Token 3742e197-f585-44f6-a027-bea6917cb4c7
Cache-Control max-age=31536000

Load Info

load time (s)0.260588
redirect count0
speed download0
server IP208.82.16.68


* all occurrences of the string "http://" have been changed to "htt???/"