Fix duplicate IDs.
--- a/master/interact.html Mon Aug 20 14:38:56 2012 +1000
+++ b/master/interact.html Mon Aug 20 14:41:05 2012 +1000
@@ -701,7 +701,7 @@
panning of an SVG document fragment.</li>
</ol>
-<h2 id="PointerEventsProperty">The <span class="property">'pointer-events'</span> property</h2>
+<h2 id="PointerEvents">The <span class="property">'pointer-events'</span> property</h2>
<p>In different circumstances, authors may want to control
under what conditions particular graphic elements can become