Remove <iframe seamless>

source

@@ -108173,10 +108173,12 @@ html, body { display: block; }</pre>
 
   <!-- body { margin: 8px; } -->
 
-  <p>For each property in the table below, given a <code>body</code> element, the first attribute
-  that exists <span>maps to the pixel length property</span> on the <code>body</code> element. If
-  none of the attributes for a property are found, or if the value of the attribute that was found
-  cannot be parsed successfully, then a default value of 8px is expected to be used for that property instead.</p>
+  <p>For each property in the table below, given a <code>body</code> element, 
+  the first attribute that exists <span>maps to the pixel length property</
+  span> on the <code>body</code> element. If none of the attributes for a 
+  property are found, or if the value of the attribute that was found cannot 
+  be parsed successfully, then a default value of 8px is expected to be used 
+  for that property instead.</p>
   <table>
    <thead>
     <tr>
@@ -109337,7 +109339,7 @@ legend {
 
   <pre class="css">@namespace url(http://www.w3.org/1999/xhtml);
 
-iframe:not([seamless]) { border: 2px inset; }
+iframe { border: 2px inset; }
 <span id="video-object-fit">video { object-fit: contain; }</span></pre>