[kevincox]

This is true but some sites handle it well. My browser auto-fills the email and password properly even though they are on separate "steps". Other sites the email field doesn't auto-complete in any way (but the password later usually does).

I don't know what the magic is here. If I had to guess they have both fields in the DOM but one is visually hidden. Then if your email is marked as SSO it is just never read.

[fmajid]

It probably has the email on form autofill, as opposed to password manager login/email+password autofill, but I use a different email for each site and that doesn't help me. On which.co.uk or AliExpress I have to laboriously type [e-mail] or [e-mail] on page 1. Some form autofill is getting smarter and is scoped to the site.

[Vinnl]

Don't underestimate the magic in your browser's autofill :)