It seems strange to me that when I go into the examples of other users and overwrite with my html code, I alter the external sources. My jsFidle example works. On the contrary, if I am in my account starting a jsfidle from scratch it does not work even if I check the JAVASCRIPT (gear) config.
Example of any Jsfidle in which I wrote about with my code and external material:
This is my jsfidle from scratch, they are the same external resources and settings in javascript:
Maybe someone helps me see what my ignorance is in this.