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/amp-footnote.html

@@ -2,8 +2,8 @@
 	/**
 	 * Footnote template to enable AMP compatibility mode.
 	 *
-	 * - Adding: Tooltips: make display work purely by style rules for AMP compatibility, thanks to @milindmore22 and @westonruter code contributions.
-	 * - Adding: Reference container: get expanding and collapsing to work also in AMP compatibility mode, thanks to @westonruter code contribution.
+	 * - Adding: Tooltips: make display work purely by style rules for AMP compatibility, thanks to @milindmore22 code contribution.
+	 * - Bugfix: Tooltips: enable accessibility by keyboard navigation, thanks to @westonruter code contribution.
 	 *
 	 * @since 2.6.0
 	 *
@@ -12,13 +12,13 @@
 	 *
 	 * @contributor @westonruter
 	 * @link https://github.com/ampproject/amp-wp/issues/5913#issuecomment-785419655
-	 * @link https://github.com/markcheret/footnotes/issues/48#issuecomment-799580854
-	 * @link https://github.com/markcheret/footnotes/issues/48#issuecomment-799582394
 	 */?>
 -->
 <span
 	class="footnote_referrer relative"
 	><[[link-span]]
+		role="button"
+		tabindex="0"
 		[[hard-link]]
 		><[[sup-span]]
 			id="footnote_plugin_tooltip_[[post_id]]_[[container_id]]_[[note_id]]"