mandarisHello tantek, I've been wondering if it makes sense for me to have duplicats of my h-card on my blog. I have asides with `hidden` properties in each article AND a h-card on the bottom of the site. It seems to work when I'm testing it and I'm afraid to change it now.
gRegormandaris, probably more of an indieweb-dev question, but take a look at https://indieweb.org/authorship-spec for multiple ways to indicate authorship. You can definitely have one h-card on the page (or even a different page, like the homepage or about page), and have each post indicate how to find the author of the post.
gRegorA possible advantage of the h-card in each post is if you're using a different avatar over time and want older posts to keep the one you used at the time. I did that on my site, that's why there's a mini h-card in the footer of each, vs. the homepage has a card at the top which always has my current avatar