Here is example of HTML form signing. Just paste iframe to any site and you get this kind of form. When signing thne this HTML will be converted to PDF and .asice container is returned to you.
Iframe code is <iframe src=”https://id.eideasy.com/sign_contract?client_id=eorVU6fqsUZpOFIzfU5h3ytKlWg4LELc&contract_id=9″>