Remove <iframe seamless>

source

@@ -26451,9 +26451,9 @@ href="?audio">audio&lt;/a> test instead.)&lt;/p></pre>
   <div class="example">
 
    <p>Here a blog uses the <code data-x="attr-iframe-srcdoc">srcdoc</code> attribute in conjunction
-   with the <code data-x="attr-iframe-sandbox">sandbox</code> attribute described below to provide users of user
-   agents that support this feature with an extra layer of protection from script injection in the
-   blog post comments:</p>
+   with the <code data-x="attr-iframe-sandbox">sandbox</code> attribute described below to provide
+   users of user agents that support this feature with an extra layer of protection from script
+   injection in the blog post comments:</p>
 
    <pre>&lt;article>
  &lt;h1>I got my own magazine!&lt;/h1>
@@ -26628,11 +26628,6 @@ href="?audio">audio&lt;/a> test instead.)&lt;/p></pre>
 
   </dl>
 
-  <p>Any <span data-x="navigate">navigation</span> required of the user agent in the <span>process
-  the <code>iframe</code> attributes</span> algorithm must be completed as an <span>explicit
-  self-navigation override</span> and with the <code>iframe</code> element's <span>node document</span>'s
-  <span>browsing context</span> as the <span>source browsing context</span>.</p>
-
   <p>Furthermore, if the <span>active document</span> of the element's <span>child browsing
   context</span> before such a <span data-x="navigate">navigation</span> was not <span>completely
   loaded</span> at the time of the new <span data-x="navigate">navigation</span>, then the <span
@@ -26936,9 +26931,9 @@ href="?audio">audio&lt;/a> test instead.)&lt;/p></pre>
   <hr> <!-- DOM -->
 
   <p>The IDL attributes <dfn><code data-x="dom-iframe-src">src</code></dfn>, <dfn><code data-x="dom-
-iframe-srcdoc">srcdoc</code></dfn>, <dfn><code data-x="dom-iframe-name">name</code></dfn>, and
-<dfn><code data-x="dom-iframe-sandbox">sandbox</code></dfn> must <span>reflect</span> the respective
-content attributes of the same name.</p>
+  iframe-srcdoc">srcdoc</code></dfn>, <dfn><code data-x ="dom-iframe-name">name</code></dfn>, and
+  <dfn><code data-x="dom-iframe- sandbox">sandbox</code></dfn> must <span>reflect</span> the
+  respective content attributes of the same name.</p>
 
   <p>The <dfn><code data-x="dom-iframe-allowFullscreen">allowFullscreen</code></dfn> IDL attribute
   must <span>reflect</span> the <code data-x="attr-iframe-allowfullscreen">allowfullscreen</code>
@@ -78637,9 +78632,6 @@ dictionary <dfn>DragEventInit</dfn> : <span>MouseEventInit</span> {
     arbitrary consistent manner, such as the most recently opened, most recently focused, or more
     closely related.</p>
 
-    <p>If the browsing context is chosen by this step to be the current browsing context, then this
-    is also an <span>explicit self-navigation override</span>.</p>
-
    </li>
 
    <li>
@@ -108174,8 +108166,8 @@ 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 
+  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>
@@ -111580,11 +111572,6 @@ if (s = prompt('What is your name?')) {
 
   </dl>
 
-  <p>Any <span data-x="navigate">navigation</span> required of the user agent in the <span>process
-  the <code>frame</code> attributes</span> algorithm must be completed as an <span>explicit
-  self-navigation override</span> and with the <code>frame</code> element's <span>node document</span>'s
-  <span>browsing context</span> as the <span>source browsing context</span>.</p>
-
   <p>Furthermore, if the <span>active document</span> of the element's <span>child browsing
   context</span> before such a <span data-x="navigate">navigation</span> was not <span>completely
   loaded</span> at the time of the new <span data-x="navigate">navigation</span>, then the <span