saw this on http://reinout.vanrees.org/weblog/2013/05/17/lighting-talks-day3.html :
<link rel="stylesheet" href="../../../../_static/bootstrap/docs/assets/css/bootstrap.css" type="text/css" />
<h1>Lightning talks day 3 - Djangocon.eu<a class="headerlink" href="#lightning-talks-day-3-djangocon-eu" title="Permalink to this headline">ΒΆ</a></h1>
then in the css:
.headerlink { visibility: hidden; } h1:hover .headerlink, h2:hover .headerlink, h3:hover .headerlink, h4:hover .headerlink, h5:hover .headerlink, h6:hover .headerlink, dt:hover .headerlink { visibility: visible; }
https://developer.apple.com/design/tips/