"Failed to load resource" using Facebook's example code

There were a couple things wrong here:

1. needed to change js.src assignment to: js.src="https://connect.facebook.net/en_US/all.js";

2. Facebook no longer supports JS SDK calls made from a local file, the script has to be run on a file with an http:// or https:// URI, as per this bug report on Facebook. I will need to upload the file to a web server, change the canvas URL accordingly, and retest.

just disable adblock, it works for me

First you need to append http or https to js.src url

Second you need to host you html file on a server.