Accessibility added, v2.6.0d6 (S.T. 2.5.10).

= Reference container semantics for assistive technology =
- Table header elements with row scope in the first column.
- Table caption invisible to sighted users but required for screen readers.
= Referrer accessibility =
- jQuery referrers are accessible but don’t show the tooltips on focus.
- AMP compatible tooltips show up on focus on navigatable referrers.
- Alternative tooltips now accessible on focus on now navigatable referrers.

git-svn-id: https://plugins.svn.wordpress.org/footnotes/trunk@2498648 b8457f37-d9ea-0310-8a92-e5e31aec5664

templates/public/footnote.html

@@ -3,8 +3,10 @@
 	 */?>
 -->
 <span
-	class="footnote_referrer"
+class="footnote_referrer"
 	><[[link-span]]
+		role="button"
+		tabindex="0"
 		onclick="footnote_moveToAnchor_[[post_id]]_[[container_id]]('footnote_plugin_reference_[[post_id]]_[[container_id]]_[[note_id]]');"
 		[[hard-link]]
 		><[[sup-span]]