Q: How do I share photos on the web?

You can share photos to Flickr of Facebook using the "Share" button.

Or you can add them to Shared Albums in iCloud.  If you have a Shared album, that has been enabled as a public webpage, you can share the photos on a webpage in iCloud. This page explains how shared albums work:  iCloud Photo Sharing FAQ - Apple Support

The big problem is, you can add Photos to shared albums in Photos, but Photos does not let you enable the "Public Website" option. It does not show in the setup panel. I hope, it is a bug and not an intentional omission.

https://help.apple.com/photos/mac/1.0/?lang=en#/pht5f6df5f0

However, If you can create and setup the shared albums in iPhoto, Aperture, or on an iPad, iPhone, you can add photos from the Photos.app to show them on your iCloud webpage.

For example, I created a shared album in Aperture like this:

Then shared photos to it from Photos,

And the published webpage looks like this:

The shared albums will be very basic. There is no way to add annotations or to control the layout.

léonie wrote:

The big problem is, you can add Photos to shared albums in Photos, but Photos does not let you enable the "Public Website" option. It does not show in the setup panel. I hope, it is a bug and not an intentional omission.

Maybe I misunderstood something, but when I select a shared album from the sidebar, in the toolbar at the top of the Photos window I get a head shaped button that when clicked on, shows me something like this:

Thanks, R C-R.  That is reassuring, that we still can publish albums as a webpage in iCloud.

I missed that panel , because I did not expect this option to be in a separate panel; eeverywhere else it is in the panel, where the shared stream is created.

And the icon is usually used for the own account setting in iCloud or at the stores, not  for settings related to albums.

Why so complicated?  We will have to be able to enable the Shared album as a public website right when we want to share it with non-mac users. It is not mentioned on the Help page for creating a shared album (https://help.apple.com/photos/mac/1.0/?lang=en#/phtf7fe6394), but hidden away on the page               Manage subscribers       ,

in the paragraph "Change settings for subscribers to a photo album".

I think what makes that icon so easy to miss is it only appears when a shared album is selected -- in fact, I never noticed it until I saw it in your second screen shot & wondered what it did!