I've literally copied/pasted this code from the Auth.net documentation for the Accept.js hosted payment form into an HTML file on my dev server. The documentation is available here:

https://developer.authorize.net/api/reference/features/acceptjs.html#Example_of_the_Complete_HTML_Pa... USING THE JAVASCRIPT LIBRARY (WITH THE HOSTED FORM)

There are no errors in JS Console. Disable Cache is marked as tick in console. The form is not loading on first try with disable cache.

The problem I am having is when you click the "Pay" button the form is not shown, only loader is showing. 
Take a look into screenshot attached
https://paste.pics/047f78eddb65a5e79ce0674f1391e23f
https://paste.pics/d40bb929fce6b5482427449cee92af0a