Use Google Favicon but Don't get default globe. when no Favicon exists

问题

How can we check favicon provided by Google API is the default globe?

https://www.google.com/s2/u/0/favicons?domain=facebook.com returns the favicon of the facebook, where as https://www.google.com/s2/u/0/favicons?domain=anyRandomFakeDomain.io returns the globe as the favicon.

How can I (with JS in the browser ONLY) check if the favicon is default globe or not?

来源：https://stackoverflow.com/questions/54970570/use-google-favicon-but-dont-get-default-globe-when-no-favicon-exists