The HTML code for embedding a public survey on a website is designed to be added to a web page that is served through a web server.
The code uses a relative URL for the survey form. This URL will not work if the web page is opened directly from a local folder.
One method for testing how a HTML file will work on the Internet is to use IIS (on Windows).
対処法
Remove the section of code starting with <script> and ending with </script>
Add http: before the backslashes in the source (src) parameter of the code
Open Survey123 HTML file with Google Chrome. At this point, the form should be displayed.