Drab is not jQuery dependent anymore, and allows to update the assign value by pushing it to the browser(s) from the server, live, without re-rendering the page.

https://tg.pl/drab

Client:

<a href="https://<%= @url%>" @style.backgroundColor=<%= @color%>>
  <%= @url %>
</a>

Immediate change color and url on the server side:

iex> poke socket, url: "tg.pl/drab", color: "red"