Which file is displayed when accessing a directory? (DirectoryIndex)

If you access your domain or a subdirectory of it directly through the web browser without specifying a particular file (e.g., https://emubox.ch/ instead of https://emubox.ch/index.html), the web server will sequentially look for files from the following list:

1. index.html
2. index.wml
3. index.cgi
4. index.shtml
5. index.js
6. index.php
7. index.phtml
8. index.php4
9. index.htm