HTML forms are capable of sending HTTP requests declaratively without the use of JavaScript: Standard HTML form submission, as described in the previous section,loads the URL where the data was sent, ...

This is a Google Apps Script library for parsing the form object from HTML form and appending the submitted values to the Spreadsheet.

If you’ve ever used JavaScript fetch API to enhance a form submission, there’s a good chance you’ve accidentally introduced a duplicate-request/race-condition ...