Drupal 8.0.0 beta 12. More info: https://www.drupal.org/node/2514176

core/themes/seven/templates/admin-block-content.html.twig

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+{#
+/**
+ * @file
+ * Seven's theme implementation for the content of an administrative block.
+ *
+ * Uses unordered list markup in both compact and extended modes.
+ *
+ * Available variables:
+ * - content: List of administrative menu items. Each menu item contains:
+ *   - url: Path to the admin section.
+ *   - title: Short name of the section.
+ *   - description: Description of the administrative menu item.
+ * - attributes: HTML attributes to be added to the element.
+ * - compact: Boolean indicating whether compact mode is turned on or not.
+ *
+ * @see template_preprocess_admin_block_content()
+ * @see seven_preprocess_admin_block_content()
+ */
+#}
+{%
+  set classes = [
+    'admin-list',
+    compact ? 'compact',
+  ]
+%}
+{% if content %}
+  <ul{{ attributes.addClass(classes) }}>
+    {% for item in content %}
+      <li><a href="{{ item.url }}"><span class="label">{{ item.title }}</span><div class="description">{{ item.description }}</div></a></li>
+    {% endfor %}
+  </ul>
+{% endif %}

core/themes/seven/templates/block-content-add-list.html.twig

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+{#
+/**
+ * @file
+ * Seven's theme implementation to display a list of custom block types.
+ *
+ * Displays the list of available custom block types for creation.
+ *
+ * Available variables:
+ * - types: A collection of all the available custom block types.
+ *   Each type contains:
+ *   - url: A link to add a block of this type.
+ *   - description: A description of this custom block type.
+ *   - label: The title of the custom block type.
+ *   - path: A path for the link to add a block of this type.
+ *
+ * @see template_preprocess_block_content_add_list()
+ * @see seven_preprocess_block_content_add_list()
+ */
+ #}
+<ul class="admin-list">
+  {% for type in types %}
+    <li class="clearfix">
+      <a href="{{ type.url }}"><span class="label">{{ type.label }}</span><div class="description">{{ type.description }}</div></a>
+    </li>
+  {% endfor %}
+</ul>

core/themes/seven/templates/install-page.html.twig

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+{#
+/**
+ * @file
+ * Seven theme implementation to display a Drupal installation page.
+ *
+ * All available variables are mirrored in page.html.twig.
+ * Some may be blank but they are provided for consistency.
+ *
+ * @see template_preprocess_install_page()
+ */
+#}
+<div class="layout-container">
+
+  <header role="banner">
+    {% if site_name %}
+      <h1 class="page-title">{{ site_name }}</h1>
+    {% endif %}
+  </header>
+
+  {% if page.sidebar_first %}
+    <aside class="layout-sidebar-first" role="complementary">
+      {{ page.sidebar_first }}
+    </aside>{# /.layout-sidebar-first #}
+  {% endif %}
+
+  <main role="main">
+    {% if title %}
+      <h1>{{ title }}</h1>
+    {% endif %}
+    {{ page.highlighted }}
+    {{ page.content }}
+  </main>
+
+  {% if page.sidebar_second %}
+    <aside class="layout-sidebar-second" role="complementary">
+      {{ page.sidebar_second }}
+    </aside>{# /.layout-sidebar-second #}
+  {% endif %}
+
+  {% if page.page_bottom %}
+    <footer role="contentinfo">
+      {{ page.page_bottom }}
+    </footer>
+  {% endif %}
+
+</div>{# /.layout-container #}

core/themes/seven/templates/maintenance-page.html.twig

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+{#
+/**
+ * @file
+ * Seven's theme implementation to display a single Drupal page while offline.
+ *
+ * All available variables are mirrored in page.html.twig.
+ * Some may be blank but they are provided for consistency.
+ *
+ * @see template_preprocess_maintenance_page()
+ */
+#}
+<div class="layout-container">
+
+  <header role="banner">
+    {% if site_name %}
+      <h1 class="page-title">{{ site_name }}</h1>
+    {% endif %}
+  </header>
+
+  {% if page.sidebar_first %}
+    <aside class="layout-sidebar-first" role="complementary">
+      {{ page.sidebar_first }}
+    </aside>{# /.layout-sidebar-first #}
+  {% endif %}
+
+  <main role="main">
+    {% if title %}
+      <h1>{{ title }}</h1>
+    {% endif %}
+    {{ page.highlighted }}
+    {{ page.content }}
+  </main>
+
+  {% if page.page_bottom %}
+    <footer role="contentinfo">
+      {{ page.page_bottom }}
+    </footer>
+  {% endif %}
+
+</div>{# /.layout-container #}

core/themes/seven/templates/menu-local-tasks.html.twig

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+{#
+/**
+ * @file
+ * Seven theme implementation to display primary and secondary local tasks.
+ *
+ * Available variables:
+ * - primary: HTML list items representing primary tasks.
+ * - secondary: HTML list items representing primary tasks.
+ *
+ * Each item in these variables (primary and secondary) can be individually
+ * themed in menu-local-task.html.twig.
+ *
+ * @see template_preprocess_menu_local_tasks()
+ *
+ * @ingroup themeable
+ */
+#}
+{% if primary %}
+  <h2 id="primary-tabs-title" class="visually-hidden">{{ 'Primary tabs'|t }}</h2>
+  <nav role="navigation" class="is-horizontal is-collapsible" aria-labelledby="primary-tabs-title" data-drupal-nav-tabs>
+    <button class="reset-appearance tabs__tab tabs__trigger" aria-label="{{ 'Primary tabs display toggle'|t }}" data-drupal-nav-tabs-trigger>&bull;&bull;&bull;</button>
+    <ul class="tabs primary clearfix" data-drupal-nav-tabs-target>{{ primary }}</ul>
+  </nav>
+{% endif %}
+{% if secondary %}
+  <h2 id="secondary-tabs-title" class="visually-hidden">{{ 'Secondary tabs'|t }}</h2>
+  <nav role="navigation" class="is-horizontal" aria-labelledby="secondary-tabs-title" data-drupal-nav-tabs>
+    <ul class="tabs secondary clearfix">{{ secondary }}</ul>
+  </nav>
+{% endif %}

core/themes/seven/templates/node-add-list.html.twig

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+{#
+/**
+ * @file
+ * Seven's theme implementation to list node types available for adding content.
+ *
+ * Available variables:
+ * - types: List of content types. Each content type contains:
+ *   - url: Path to the add content of this type page.
+ *   - label: The title of this type of content.
+ *   - description: Description of this type of content.
+ *
+ * @see template_preprocess_node_add_list()
+ * @see seven_preprocess_node_add_list()
+ */
+#}
+{% if content %}
+  <ul class="admin-list">
+    {% for type in types %}
+      <li class="clearfix"><a href="{{ type.url }}"><span class="label">{{ type.label }}</span><div class="description">{{ type.description }}</div></a></li>
+    {% endfor %}
+  </ul>
+{% else %}
+  <p>
+    {% set create_content = path('node.type_add') %}
+    {% trans %}
+      You have not created any content types yet. Go to the <a href="{{ create_content }}">content type creation page</a> to add a new content type.
+    {% endtrans %}
+  </p>
+{% endif %}

core/themes/seven/templates/page.html.twig

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+{#
+/**
+ * @file
+ * Seven's theme implementation to display a single Drupal page.
+ *
+ * The doctype, html, head, and body tags are not in this template. Instead
+ * they can be found in the html.html.twig template normally located in the
+ * core/modules/system directory.
+ *
+ * Available variables:
+ *
+ * General utility variables:
+ * - base_path: The base URL path of the Drupal installation. Will usually be
+ *   "/" unless you have installed Drupal in a sub-directory.
+ * - is_front: A flag indicating if the current page is the front page.
+ * - logged_in: A flag indicating if the user is registered and signed in.
+ * - is_admin: A flag indicating if the user has permission to access
+ *   administration pages.
+ *
+ * Site identity:
+ * - front_page: The URL of the front page. Use this instead of base_path when
+ *   linking to the front page. This includes the language domain or prefix.
+ * - logo: The url of the logo image, as defined in theme settings.
+ * - site_name: The name of the site. This is empty when displaying the site
+ *   name has been disabled in the theme settings.
+ * - site_slogan: The slogan of the site. This is empty when displaying the site
+ *   slogan has been disabled in theme settings.
+ *
+ * Page content (in order of occurrence in the default page.html.twig):
+ * - title_prefix: Additional output populated by modules, intended to be
+ *   displayed in front of the main title tag that appears in the template.
+ * - title: The page title, for use in the actual content.
+ * - title_suffix: Additional output populated by modules, intended to be
+ *   displayed after the main title tag that appears in the template.
+ * - tabs: Tabs linking to any sub-pages beneath the current page (e.g., the
+ *   view and edit tabs when displaying a node).
+ * - action_links: Actions local to the page, such as "Add menu" on the menu
+ *   administration interface.
+ * - node: Fully loaded node, if there is an automatically-loaded node
+ *   associated with the page and the node ID is the second argument in the
+ *   page's path (e.g. node/12345 and node/12345/revisions, but not
+ *   comment/reply/12345).
+ *
+ * Regions:
+ * - page.page_top: Items for the header region.
+ * - page.highlighted: Items for the highlighted region.
+ * - page.help: Dynamic help text, mostly for admin pages.
+ * - page.content: The main content of the current page.
+ * - page.sidebar_first: Items for the first sidebar.
+ * - page.sidebar_second: Items for the second sidebar.
+ * - page.page_bottom: Items for the footer region.
+ * - page.breadcrumb: Items for the breadcrumb region.
+ *
+ * @see template_preprocess_page()
+ * @see seven_preprocess_page()
+ * @see html.html.twig
+ */
+#}
+  <header class="content-header clearfix">
+    <div class="layout-container">
+      {{ title_prefix }}
+      {% if title %}
+        <h1 class="page-title">{{ title }}</h1>
+      {% endif %}
+      {{ title_suffix }}
+      {% if primary_local_tasks %}
+        {{ primary_local_tasks }}
+      {% endif %}
+    </div>
+  </header>
+
+  <div class="layout-container">
+    {% if secondary_local_tasks %}
+      <div class="tabs-secondary clearfix" role="navigation">{{ secondary_local_tasks }}</div>
+    {% endif %}
+
+    {{ page.breadcrumb }}
+
+    <main class="page-content clearfix" role="main">
+      <div class="visually-hidden"><a id="main-content" tabindex="-1"></a></div>
+      {{ page.highlighted }}
+      {% if page.help %}
+        <div class="help">
+          {{ page.help }}
+        </div>
+      {% endif %}
+      {% if action_links %}
+        <ul class="action-links">
+          {{ action_links }}
+        </ul>
+      {% endif %}
+      {{ page.content }}
+    </main>
+
+  </div>

core/themes/seven/templates/tablesort-indicator.html.twig

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+{#
+/**
+ * @file
+ * Seven's theme implementation for displaying a tablesort indicator.
+ *
+ * Available variables:
+ * - style: Either 'asc' or 'desc', indicating the sorting direction.
+ * - arrow_asc: URL to the image for an ascending arrow.
+ * - arrow_desc: URL to the image for a descending arrow.
+ */
+#}
+{% if style == 'asc' -%}
+  <img src="{{ arrow_asc }}" width="9" height="5" alt="{{ 'Sort ascending'|t }}" title="{{ 'Sort ascending'|t }}" />
+{% else -%}
+  <img src="{{ arrow_desc }}" width="9" height="5" alt="{{ 'Sort descending'|t }}" title="{{ 'Sort descending'|t }}" />
+{% endif %}