Found a few ways in which the Braille problem with browsers could resurface. Fixed now.

tests/browser-linked-headings.html

@@ -9,6 +9,8 @@
 <h3><span><a href="#post" onclick="document.title='Cthulhu Linked Heading Post';">#1</a></span> Username <a href="#date" onclick="document.title='Cthulhu Linked Heading Date';">Example date</a></h3>
 <p id="post">Post destination</p><p id="date">Date destination</p>
 <h4>Ordinary heading</h4>
+<h4>Before <a href="#image"><img alt="Linked image title"></a> after</h4>
+<p id="image">Image destination</p>
 <h5>Choose: <a href="#first">First link</a> and <a href="#second">Second link</a></h5>
 <p id="first">First destination</p><p id="second">Second destination</p>
 <h6 style="margin-top: 1200px"><a href="#sound-first">Offscreen first topic</a></h6>