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themes/bootstrap/templates/block/block--system-branding-block.html.twig

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+{% extends "block--bare.html.twig" %}
+{#
+/**
+ * @file
+ * Default theme implementation for a branding block.
+ *
+ * Each branding element variable (logo, name, slogan) is only available if
+ * enabled in the block configuration.
+ *
+ * Available variables:
+ * - site_logo: Logo for site as defined in Appearance or theme settings.
+ * - site_name: Name for site as defined in Site information settings.
+ * - site_slogan: Slogan for site as defined in Site information settings.
+ *
+ * @ingroup templates
+ */
+#}
+{% block content %}
+  {% if site_logo %}
+    <a class="logo navbar-btn pull-left" href="{{ path('<front>') }}" title="{{ 'Home'|t }}" rel="home">
+      <img src="{{ site_logo }}" alt="{{ 'Home'|t }}" />
+    </a>
+  {% endif %}
+  {% if site_name %}
+    <a class="name navbar-brand" href="{{ path('<front>') }}" title="{{ 'Home'|t }}" rel="home">{{ site_name }}</a>
+  {% endif %}
+  {% if site_slogan %}
+    <p class="navbar-text">{{ site_slogan }}</p>
+  {% endif %}
+{% endblock %}