diff --git a/source b/source
index 3a0d3fcc078..b2f5257e283 100644
--- a/source
+++ b/source
@@ -35276,12 +35276,13 @@ interface <dfn interface>HTMLIFrameElement</dfn> : <span>HTMLElement</span> {
   <hr> <!-- FEATURE POLICY ATTRIBUTES: ALLOW; ALLOW FULLSCREEN / PAYMENT REQUEST / USER MEDIA -->
 
   <p>The <dfn element-attr for="iframe"><code data-x="attr-iframe-allow">allow</code></dfn>
-  attribute, when specified, determines the <span data-x="concept-container-policy">container
-  policy</span> that will be used when the <span
-  data-x="concept-document-permissions-policy">permissions policy</span> for a
-  <code>Document</code> in the <code>iframe</code>'s <span>content navigable</span> is initialized.
-  Its value must be a <span data-x="concept-serialized-permissions-policy">serialized permissions
-  policy</span>. <ref>PERMISSIONSPOLICY</ref></p>
+  attribute, when specified, defines the <span data-x="concept-container-policy">container
+  policy</span> that applies to the iframe and determines the <span
+  data-x="concept-document-permissions-policy">permissions policy</span> that will be enforced when
+  the nested <code>Document</code> in the <code>iframe</code>'s <span>content navigable</span> is
+  initialized. Its value must be a <span data-x="concept-serialized-permissions-policy">serialized
+  permissions policy</span>. <ref>PERMISSIONSPOLICY</ref></p>
+
 
   <div class="example">
    <p>In this example, an <code>iframe</code> is used to embed a map from an online navigation