Initial Drupal 11 with DDEV setup

web/core/modules/responsive_image/templates/responsive-image-formatter.html.twig

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+{#
+/**
+ * @file
+ * Default theme implementation to display a formatted responsive image field.
+ *
+ * Available variables:
+ * - responsive_image: A collection of responsive image data.
+ * - url: An optional URL the image can be linked to.
+ *
+ * @see template_preprocess_responsive_image_formatter()
+ *
+ * @ingroup themeable
+ */
+#}
+{% if url %}
+  <a href="{{ url }}">{{ responsive_image }}</a>
+{% else %}
+  {{ responsive_image }}
+{% endif %}

web/core/modules/responsive_image/templates/responsive-image.html.twig

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+{#
+/**
+ * @file
+ * Default theme implementation of a responsive image.
+ *
+ * Available variables:
+ * - sources: The attributes of the <source> tags for this <picture> tag.
+ * - img_element: The controlling image, with the fallback image in srcset.
+ * - output_image_tag: Whether or not to output an <img> tag instead of a
+ *   <picture> tag.
+ *
+ * @see template_preprocess_responsive_image()
+ *
+ * @ingroup themeable
+ */
+#}
+{% if output_image_tag %}
+  {{ img_element }}
+{% else %}
+  <picture>
+    {% if sources %}
+      {% for source_attributes in sources %}
+        <source{{ source_attributes }}/>
+      {% endfor %}
+    {% endif %}
+    {# The controlling image, with the fallback image in srcset. #}
+    {{ img_element }}
+  </picture>
+{% endif %}