Ignore changes to name attributes

Name attributes of elements that can create nested browsing contexts (embed, frame, iframe, object) are only to be considered when the nested browsing context is created.

Tests: web-platform-tests/wpt#15392.

source

@@ -30091,16 +30091,7 @@ interface <dfn>HTMLIFrameElement</dfn> : <span>HTMLElement</span> {
 
   <p>The <dfn><code data-x="attr-iframe-name">name</code></dfn> attribute, if present, must be a
   <span>valid browsing context name</span>. The given value is used to name the <span>nested
-  browsing context</span>.</p>
-
-  <div w-nodev>
-
-  <p>Whenever the <code data-x="attr-iframe-name">name</code> attribute is set, the nested
-  <span>browsing context</span>'s <span data-x="browsing context name">name</span> must be changed to
-  the new value. If the attribute is removed, the <span>browsing context name</span> must be set to
-  the empty string.</p>
-
-  </div>
+  browsing context</span> if present when the <span>nested browsing context</span> is created.</p>
 
 
   <hr> <!-- SANDBOX -->
@@ -30941,7 +30932,8 @@ interface <dfn>HTMLObjectElement</dfn> : <span>HTMLElement</span> {
 
   <p>The <dfn><code data-x="attr-object-name">name</code></dfn> attribute, if present, must be a
   <span>valid browsing context name</span>. The given value is used to name the <span>nested
-  browsing context</span>, if applicable.</p>
+  browsing context</span>, if applicable, and if present when the <span>nested browsing
+  context</span> is created.</p>
 
   <div w-nodev>
 
@@ -115495,12 +115487,6 @@ interface <dfn>HTMLFrameSetElement</dfn> : <span>HTMLElement</span> {
 
   <!-- END of section that's very similar to <iframe> -->
 
-  <p>Whenever the <code undefined data-x="attr-frame-name">name</code> attribute is set and the
-  <code>frame</code> element's <span>nested browsing context</span> is non-null, the <span>nested
-  browsing context</span>'s <span data-x="browsing context name">name</span> must be changed to the
-  new value. If the attribute is removed, the <span>browsing context name</span> must be set to the
-  empty string.</p>
-
   <p>The <code>frame</code> element must implement the <code>HTMLFrameElement</code> interface.</p>
 
   <pre><code class="idl" data-x="">[Exposed=Window,