All Shared Photo Albums are missing online

Since talking to Apple Support, I now understand that iCloud shared photo albums cannot be viewed online at icloud.com using any browser, unless the shared album was created specifically as a public album. The only photos you'll see at icloud.com are your personal photos/albums.

This seems counter to what the Help documents say, such as "Your friends and family can use iCloud to view, like, and comment on your shared photos and videos from their iOS devices, Mac and Windows computers, or even Apple TV. (They can read but not add comments on Apple TV.)" and "You and subscribers to your shared albums can add more photos and videos. (Subscribers need an iOS device, Mac, or Windows computer set up for iCloud Photo Sharing.)"

Somewhat misleading, no?

Your answer is correct, and I admit I haven't tried this with shared albums other than my own. But it seems abnormally cumbersome, and rather insecure, that another iCloud for Windows user, with whom I've shared an album, would have to download the entire contents of a shared album to their local hard disk in order to view, like and/or comment on a photo. Oh well, never mind, it's unlikely I'll use the feature anyway.