A few years ago, I co-wrote a book on third-party scripting that includes best practices for loading JavaScript applications on other people's websites: https:/

A few years ago, I co-wrote a book on third-party scripting that includes best practices for loading JavaScript applications on other people's websites: https://manning.com/vinegar https://manning.com/vinegar It definitely includes a discussion on why document.write is undesirable, and suggests async, defer, and other alternatives instead. /shameless plug