Credential API not working on https localhost

# Running this on https://google.com returns expected behavior:
# Chrome prompts you to save your credentials

# This also works if you spin up an http server i.e: `python -m SimpleHTTPServer`
# and run it in your console.

# However running on https://localhost results in a silent failure
# where the success function fires but you are not prompted.
# Easy way to spin up a simple https server is: https://gist.github.com/dergachev/7028596

var creds = new PasswordCredential({
	id: "[email protected]",
	password:"password1"
});

navigator.credentials.store(creds).then(function(){
	console.log("Done saving credentials");
});