Web fixes.

tests/browser-link-sounds.html

@@ -0,0 +1,18 @@
+<!doctype html>
+<html lang="en"><meta charset="utf-8"><title>Cthulhu Browser Probe</title>
+<style>
+body { margin: 8px; }
+.row { height: 60px; }
+a { display: block; position: relative; width: 140px; }
+.center { left: calc(50% - 70px); }
+.right { left: calc(100% - 140px); }
+@media (max-width: 1000px) { main { margin-top: 1000px; } }
+</style>
+<h1 tabindex="0">Sound fixture start</h1>
+<main>
+<div class="row"><a href="#destination"><span>Left link label</span></a></div>
+<div class="row"><a class="center" href="#destination"><span>Center link label</span></a></div>
+<div class="row"><a class="right" href="#destination"><span>Right link label</span></a></div>
+</main>
+<p id="destination">Destination</p>
+</html>