Update to Drupal 8.0-dev-2015-11-17. Commits through da81cd220, Tue Nov 17 15:53:49 2015 +0000, Issue #2617224 by Wim Leers: Move around/fix some documentation.

core/themes/stable/templates/misc/feed-icon.html.twig

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+{#
+/**
+ * @file
+ * Theme override for a feed icon.
+ *
+ * Available variables:
+ * - url: An internal system path or a fully qualified external URL of the feed.
+ * - attributes: Remaining HTML attributes for the feed link.
+ *   - title: A descriptive title of the feed link.
+ *   - class: HTML classes to be applied to the feed link.
+ */
+#}
+<a href="{{ url }}"{{ attributes.addClass('feed-icon') }}>
+  {{ 'Subscribe to @title'|t({'@title': title}) }}
+</a>

core/themes/stable/templates/misc/progress-bar.html.twig

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+{#
+/**
+ * @file
+ * Theme override for a progress bar.
+ *
+ * Note that the core Batch API uses this only for non-JavaScript batch jobs.
+ *
+ * Available variables:
+ * - label: The label of the working task.
+ * - percent: The percentage of the progress.
+ * - message: A string containing information to be displayed.
+ */
+#}
+<div class="progress" data-drupal-progress>
+  {% if label %}
+    <div class="progress__label">{{ label }}</div>
+  {% endif %}
+  <div class="progress__track"><div class="progress__bar" style="width: {{ percent }}%"></div></div>
+  <div class="progress__percentage">{{ percent }}%</div>
+  <div class="progress__description">{{ message }}</div>
+</div>

core/themes/stable/templates/misc/rdf-metadata.html.twig

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+{#
+/**
+ * @file
+ * Theme override for empty spans with RDF attributes.
+ *
+ * The XHTML+RDFa doctype allows either <span></span> or <span /> syntax to
+ * be used, but for maximum browser compatibility, W3C recommends the
+ * former when serving pages using the text/html media type, see
+ * http://www.w3.org/TR/xhtml1/#C_3.
+ *
+ * Available variables:
+ * - metadata: Each item within corresponds to its own set of attributes,
+ *   and therefore, needs its own 'attributes' element.
+ *
+ * @see template_preprocess_rdf_metadata()
+ */
+#}
+{% for attributes in metadata %}
+  <span{{ attributes.addClass('hidden') }}></span>
+{% endfor %}

core/themes/stable/templates/misc/rdf-wrapper.html.twig

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+{#
+/**
+ * @file
+ * Theme override for wrapping content with RDF attributes.
+ *
+ * Available variables:
+ * - content: The content being wrapped with RDF attributes.
+ * - attributes: HTML attributes, including RDF attributes for wrapper element.
+ */
+#}
+<span{{ attributes }}>{{ content }}</span>

core/themes/stable/templates/misc/status-messages.html.twig

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+{#
+/**
+ * @file
+ * Theme override for status messages.
+ *
+ * Displays status, error, and warning messages, grouped by type.
+ *
+ * An invisible heading identifies the messages for assistive technology.
+ * Sighted users see a colored box. See http://www.w3.org/TR/WCAG-TECHS/H69.html
+ * for info.
+ *
+ * Add an ARIA label to the contentinfo area so that assistive technology
+ * user agents will better describe this landmark.
+ *
+ * Available variables:
+ * - message_list: List of messages to be displayed, grouped by type.
+ * - status_headings: List of all status types.
+ * - display: (optional) May have a value of 'status' or 'error' when only
+ *   displaying messages of that specific type.
+ * - attributes: HTML attributes for the element, including:
+ *   - class: HTML classes.
+ *
+ * @see template_preprocess_status_messages()
+ */
+#}
+{% for type, messages in message_list %}
+  <div role="contentinfo" aria-label="{{ status_headings[type] }}"{{ attributes|without('role', 'aria-label') }}>
+    {% if type == 'error' %}
+      <div role="alert">
+    {% endif %}
+      {% if status_headings[type] %}
+        <h2 class="visually-hidden">{{ status_headings[type] }}</h2>
+      {% endif %}
+      {% if messages|length > 1 %}
+        <ul>
+          {% for message in messages %}
+            <li>{{ message }}</li>
+          {% endfor %}
+        </ul>
+      {% else %}
+        {{ messages|first }}
+      {% endif %}
+    {% if type == 'error' %}
+      </div>
+    {% endif %}
+  </div>
+{% endfor %}