diff --git a/src/snek/system/template.py b/src/snek/system/template.py
index 81306e9..236c805 100644
--- a/src/snek/system/template.py
+++ b/src/snek/system/template.py
@@ -151,6 +151,15 @@ SAFE_ATTRIBUTES = {
     "aria-hidden",
     "aria-label",
     "srcset",
+    "target",
+    "rel",
+    "referrerpolicy",
+    "controls",
+    "frameborder",
+    "allow",
+    "allowfullscreen",
+    "title",
+    "referrerpolicy",
 }
 
 
@@ -447,7 +456,7 @@ def embed_url(text):
 
                     description_element.append(
                         BeautifulSoup(
-                            f"<p class='page-description'>{page_description or "No description available."}</p>",
+                            f"<p class='page-description'>{page_description or 'No description available.'}</p>",
                             "html.parser",
                         )
                     )