How do I transfer state parameters from a domain to a subdomain in a link?

Question

Hello, everyone!
There is a domain domen.com and a subdomain poddomen.domen.com

The domain has links leading to the subdomain, depending on how you click on which subdomain should be either open or hidden (close) block

Link 1

Link 2

Lorem ipsum

.block {
display: none;
}
.block.open {
display: block;
}

Question: How do I transfer state parameters from a domain to a subdomain?

$('a').on('click', function () {
e.preventDefault();
location.href = $(this).getAttribute('href') + '?' +$(this).data('display');
});

Comments

.block {
  display: none;
}
.block.open {
   display: block;
}

When will you learn how to https://www.w3schools.com/tags/att_hidden.asp

---

Alex but its support is not perfect, ie10 is still needed

Answer 1

What's the problem?

<p><a href="poddomen.domen.com?display=open">Ссылка 1</a></p>
<p><a href="poddomen.domen.com?display=close">Ссылка 2</a></p>

Answer 2

I would just use cookies in the ".name.domain" domain. Such cookies, with a dot at the beginning, work throughout the domain with subdomains. Another option is to load a dynamic script from a subdomain in the domain. The script generator sees the contents of the session and generates a script that will show or hide the buttons.