However, the internet has moved on. Modern sites use PHP, Python, or Javascript frameworks. Finding a .shtml page today is like finding a VHS player in a world of 4K streaming. It usually signifies —old, unpatched, and often forgotten devices.
To avoid confusion:
Sometimes papers are cited as: (Author, 2021, p. 24) – but index.shtml is unusual. Possibly a URL to an online appendix. inurl view index shtml 24 2021