Output each accesskey only once, regardless of the number of relbars.

sphinx/jinja2glue.py

@@ -26,6 +26,15 @@ def _tobool(val):
         return val.lower() in ('true', '1', 'yes', 'on')
     return bool(val)
 
+def accesskey(context, key):
+    """Helper to output each access key only once."""
+    if '_accesskeys' not in context:
+        context.vars['_accesskeys'] = {}
+    if key not in context.vars['_accesskeys']:
+        context.vars['_accesskeys'][key] = 1
+        return 'accesskey="%s"' % key
+    return ''
+
 
 class BuiltinTemplateLoader(TemplateBridge, BaseLoader):
     """
@@ -64,6 +73,7 @@ class BuiltinTemplateLoader(TemplateBridge, BaseLoader):
                                                 extensions=extensions)
         self.environment.filters['tobool'] = _tobool
         self.environment.globals['debug'] = contextfunction(pformat)
+        self.environment.globals['accesskey'] = contextfunction(accesskey)
         if use_i18n:
             self.environment.install_gettext_translations(builder.translator)
 

sphinx/themes/basic/layout.html

@@ -12,14 +12,14 @@
         {%- for rellink in rellinks %}
         <li class="right" {% if loop.first %}style="margin-right: 10px"{% endif %}>
           <a href="{{ pathto(rellink[0]) }}" title="{{ rellink[1]|striptags }}"
-             accesskey="{{ rellink[2] }}">{{ rellink[3] }}</a>
+             {{ accesskey(rellink[2]) }}>{{ rellink[3] }}</a>
           {%- if not loop.first %}{{ reldelim2 }}{% endif %}</li>
         {%- endfor %}
         {%- block rootrellink %}
         <li><a href="{{ pathto(master_doc) }}">{{ shorttitle|e }}</a>{{ reldelim1 }}</li>
         {%- endblock %}
         {%- for parent in parents %}
-          <li><a href="{{ parent.link|e }}" accesskey="U">{{ parent.title }}</a>{{ reldelim1 }}</li>
+          <li><a href="{{ parent.link|e }}" {% if loop.last %}{{ accesskey("U") }}{% endif %}>{{ parent.title }}</a>{{ reldelim1 }}</li>
         {%- endfor %}
         {%- block relbaritems %} {% endblock %}
       </ul>