Some forum software is showing a line between two posts to show exactly from what position the new, unread posts start. You can see an example attached.
I would prefer ElkArte could do this too (other than just jump to the first unread post and show it on the top of the browser).
I think you would have to use some JS to target that, at least with how the current template is. For example you would add
$('#new').parent().prev('hr').css('display', 'block'); in theme.js, somewhere inside the first
$(function() {} for 1.1 or inside the
$(document).ready(function() { for 1.0
That seems a bit clumsy to me, and with some template tweaks you could just do it with css. I don't think that #new is used in other places, but if so that JS may cause a page layout change somewhere not expected.
Made an enhancement PR to 1.1, for consideration. It adds this feature
(Link-4448) with just CSS.