From 61f585ed2726753bb909857d7819b7c6eadebd5a Mon Sep 17 00:00:00 2001
From: ritsyy <richarupela95@gmail.com>
Date: Fri, 8 Jan 2016 00:25:51 +0530
Subject: [PATCH] Remove <iframe seamless> Commits Related to it:
 https://github.com/whatwg/html/commit/dfa3f22b5278113cba689c3cf6e358f17e334311
 https://github.com/whatwg/html/commit/8edfe6da5a635f1c31f3ea22f2d323adc33b938e
 https://github.com/whatwg/html/commit/9e4f0956b3b2605f3cb25d5c77c63f8ef827a617
 https://github.com/whatwg/html/commit/b0b5d7b1689440533f696b6cf62fd0ac43d07e2e
 https://github.com/whatwg/html/commit/b3bf8adbac93f4db6a63f432254dd39ea7e195e0
 https://github.com/whatwg/html/commit/e5a041ecdf7fa8ba95bf88b31bee46b9ef60fddc
 https://github.com/whatwg/html/commit/cc33290d68d2d3e2dc66760c6dc3df3e68007c5d
 https://github.com/whatwg/html/commit/c4d639680480bd0835b2a1b2e5c607c482575984
 https://github.com/whatwg/html/commit/f6490f17f577fa3478791b29ad8c2b586418001f
 https://github.com/whatwg/html/commit/77e24cd9c86d46f2a344117c87ea57d80815721b
 https://github.com/whatwg/html/commit/0eab1ddcc8ad99280cdbda1d94cef1acc634036c
 https://github.com/whatwg/html/commit/1782006e84aaf3c757d05c9ca4ed8317522cc741
 https://github.com/whatwg/html/commit/2898fa992584f4b5c545c2d95d56fb72dbe16f71
 https://github.com/whatwg/html/commit/3a6cfaf2d3ca9918a0cd6813f5c74830058cba89
 https://github.com/whatwg/html/commit/5ae9881e392194447a1dade8043b0613b5217ecc
 https://github.com/whatwg/html/commit/f1c0cadb6a9a27f24fde8d179614acd71b01ab5c
 https://github.com/whatwg/html/commit/748113c0779f0c913df72e44b30484d887875f67
 https://github.com/whatwg/html/commit/4814a86cacecf0904a0b37ddfbf1027f48e3da6a
 https://github.com/whatwg/html/commit/9dd420c453382f48aa8efe704eb430981e9c8122

---
 source | 308 +++------------------------------------------------------
 1 file changed, 13 insertions(+), 295 deletions(-)

diff --git a/source b/source
index ea0c892a6f5..01d7f8d892f 100644
--- a/source
+++ b/source
@@ -26385,7 +26385,6 @@ href="?audio">audio&lt;/a> test instead.)&lt;/p></pre>
    <dd><code data-x="attr-iframe-srcdoc">srcdoc</code></dd>
    <dd><code data-x="attr-iframe-name">name</code></dd>
    <dd><code data-x="attr-iframe-sandbox">sandbox</code></dd>
-   <dd><code data-x="attr-iframe-seamless">seamless</code></dd>
    <dd><code data-x="attr-iframe-allowfullscreen">allowfullscreen</code></dd>
    <dd><code data-x="attr-dim-width">width</code></dd>
    <dd><code data-x="attr-dim-height">height</code></dd>
@@ -26396,7 +26395,6 @@ href="?audio">audio&lt;/a> test instead.)&lt;/p></pre>
   attribute DOMString <span data-x="dom-iframe-srcdoc">srcdoc</span>;
   attribute DOMString <span data-x="dom-iframe-name">name</span>;
   [PutForwards=<span data-x="dom-DOMSettableTokenList-value">value</span>] readonly attribute <span>DOMSettableTokenList</span> <span data-x="dom-iframe-sandbox">sandbox</span>;
-  attribute boolean <span data-x="dom-iframe-seamless">seamless</span>;
   attribute boolean <span data-x="dom-iframe-allowFullscreen">allowFullscreen</span>;
   attribute DOMString <span data-x="dom-dim-width">width</span>;
   attribute DOMString <span data-x="dom-dim-height">height</span>;
@@ -26453,10 +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> and <code
-   data-x="attr-iframe-seamless">seamless</code> attributes 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>
@@ -26469,15 +26466,15 @@ href="?audio">audio&lt;/a> test instead.)&lt;/p></pre>
  &lt;/footer>
  &lt;article>
   &lt;footer> Thirteen minutes ago, &lt;a href="/users/ch">ch&lt;/a> wrote: &lt;/footer>
-  &lt;iframe seamless sandbox srcdoc="&lt;p>did you get a cover picture yet?">&lt;/iframe>
+  &lt;iframe sandbox srcdoc="&lt;p>did you get a cover picture yet?">&lt;/iframe>
  &lt;/article>
  &lt;article>
   &lt;footer> Nine minutes ago, &lt;a href="/users/cap">cap&lt;/a> wrote: &lt;/footer>
-  &lt;iframe seamless sandbox srcdoc="&lt;p>Yeah, you can see it &lt;a href=&amp;quot;/gallery?mode=cover&amp;amp;amp;page=1&amp;quot;>in my gallery&lt;/a>.">&lt;/iframe>
+  &lt;iframe sandbox srcdoc="&lt;p>Yeah, you can see it &lt;a href=&amp;quot;/gallery?mode=cover&amp;amp;amp;page=1&amp;quot;>in my gallery&lt;/a>.">&lt;/iframe>
  &lt;/article>
  &lt;article>
   &lt;footer> Five minutes ago, &lt;a href="/users/ch">ch&lt;/a> wrote: &lt;/footer>
-  &lt;iframe seamless sandbox srcdoc="&lt;p>hey that's earl's table.
+  &lt;iframe sandbox srcdoc="&lt;p>hey that's earl's table.
 &lt;p>you should get earl&amp;amp;amp;me on the next cover.">&lt;/iframe>
  &lt;/article></pre>
 
@@ -26631,11 +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
@@ -26876,170 +26868,6 @@ href="?audio">audio&lt;/a> test instead.)&lt;/p></pre>
   </div>
 
 
-  <hr> <!-- SEAMLESS -->
-
-  <p>The <dfn><code data-x="attr-iframe-seamless">seamless</code></dfn> attribute is a <span>boolean
-  attribute</span>. When specified, it indicates that the <code>iframe</code> element's
-  <span>browsing context</span> is to be rendered in a manner that makes it appear to be part of the
-  containing document (seamlessly included in the parent document).</p>
-
-  <div class="example">
-
-   <p id="inclusion">An HTML inclusion is effected using this attribute as in the following example.
-   In this case, the inclusion is of a site-wide navigation bar. Any links in the
-   <code>iframe</code> will, in new user agents, be automatically opened in the
-   <code>iframe</code>'s parent browsing context; for legacy user agents, the site could also
-   include a <code>base</code> element with a <code data-x="attr-base-target">target</code>
-   attribute with the value <code data-x="">_parent</code>. Similarly, in new user agents the styles
-   of the parent page will be automatically applied to the contents of the frame, but to support
-   legacy user agents authors might wish to include the styles explicitly.</p>
-
-   <pre>&lt;!DOCTYPE HTML>
-&lt;title>Mirror Mirror &mdash; MovieInfo&trade;&lt;/title>
-&lt;header>
- &lt;hgroup>
-  &lt;h1>Mirror Mirror&lt;/h1>
-  &lt;h2>Part of the MovieInfo&trade; Database&lt;/h2>
- &lt;/hgroup>
- &lt;nav>
-  <strong>&lt;iframe seamless src="nav.inc">&lt;/iframe></strong>
- &lt;/nav>
-&lt;/header>
-...</pre>
-
-  </div>
-
-  <div w-nodev>
-
-  <p>An <code>iframe</code> element is said to be <dfn>in seamless mode</dfn> when all of the
-  following conditions are met:</p>
-
-  <ul>
-
-   <li>The <code data-x="attr-iframe-seamless">seamless</code> attribute is set on the
-   <code>iframe</code> element, and
-
-   <li>The <code>iframe</code> element's owner <code>Document</code>'s <span>active sandboxing flag
-   set</span> does not have the <span>sandboxed seamless iframes flag</span> set, and
-
-   <li>Either:
-
-    <ul>
-
-     <li>The <span>browsing context</span>'s <span>active document</span> has the <span>same
-     origin</span> as the <code>iframe</code> element's <span>node document</span>, or
-
-     <li>The <span>browsing context</span>'s <span>active document</span>'s <em><span data-x="the
-     document's address">address</span></em> has the <span>same origin</span> as the
-     <code>iframe</code> element's <span>node document</span>, or
-
-     <li>The <span>browsing context</span>'s <span>active document</span> is <span>an
-     <code>iframe</code> <code data-x="attr-iframe-srcdoc">srcdoc</code> document</span>.
-
-    </ul>
-
-   </li>
-
-  </ul>
-
-  <p>When an <code>iframe</code> element is <span>in seamless mode</span>, the following
-  requirements apply:</p>
-
-  <ul>
-
-   <li><p>The user agent must set the <dfn>seamless browsing context flag</dfn> to true for that
-   <span>browsing context</span>. This will <a href="#seamlessLinks">cause links to open in the
-   parent browsing context</a> unless an <span>explicit self-navigation override</span> is used
-   (<code data-x="">target="_self"</code>).</p></li>
-
-   <li><p>Media queries in the context of the <code>iframe</code>'s <span>browsing context</span>
-   (e.g. on <code data-x="attr-style-media">media</code> attributes of <code>style</code> elements in
-   <code>Document</code>s in that <code>iframe</code>) must be evaluated with respect to the nearest
-   <span>ancestor browsing context</span> that is not itself being <span data-x="browsing context
-   nested through">nested through</span> an <code>iframe</code> that is <span>in seamless
-   mode</span>. <ref spec=MQ></p></li>
-
-   <li><p>In a CSS-supporting user agent: the user agent must add all the style sheets that apply to
-   the <code>iframe</code> element to the cascade of the <span>active document</span> of the
-   <code>iframe</code> element's <span>nested browsing context</span>, at the appropriate cascade
-   levels, before any style sheets specified by the document itself.</p></li>
-
-   <li><p>In a CSS-supporting user agent: the user agent must, for the purpose of CSS property
-   inheritance only, treat the root element of the <span>active document</span> of the
-   <code>iframe</code> element's <span>nested browsing context</span> as being a child of the
-   <code>iframe</code> element. (Thus inherited properties on the root element of the document in
-   the <code>iframe</code> will inherit the computed values of those properties on the
-   <code>iframe</code> element instead of taking their initial values.)</p></li>
-
-   <li><p>In visual media, in a CSS-supporting user agent: the user agent should set the
-   <span>intrinsic width</span> of the <code>iframe</code> to the width that the element would have
-   if it was a non-replaced block-level element with 'width: auto', unless that width would be zero
-   (e.g. if the element is floating or absolutely positioned), in which case the user agent should
-   set the <span>intrinsic width</span> of the <code>iframe</code> to the shrink-to-fit width of
-   the root element (if any) of the content rendered in the <code>iframe</code>.</p></li>
-
-   <li><p>In visual media, in a CSS-supporting user agent: the user agent should set the
-   <span>intrinsic height</span> of the <code>iframe</code> to the shortest height that would make
-   the content rendered in the <code>iframe</code> at its current width (as given in the previous
-   bullet point) have no scrollable overflow at its bottom edge<!--, if the scrolling position was
-   such that the top of the viewport for the content rendered in the <code>iframe</code> was
-   aligned with the origin of that content's canvas-->. Scrollable overflow is any overflow that
-   would increase the range to which a scrollbar or other scrolling mechanism can scroll.</p></li>
-
-   <li>
-
-    <p>In visual media, in a CSS-supporting user agent: the user agent must force the height of the
-    initial containing block of the <span>active document</span> of the <span>nested browsing
-    context</span> of the <code>iframe</code> to zero.</p>
-
-    <p class="note">This is intended to get around the otherwise circular dependency of percentage
-    dimensions that depend on the height of the containing block, thus affecting the height of the
-    document's bounding box, thus affecting the height of the viewport, thus affecting the size of
-    the initial containing block.</p>
-
-   </li>
-
-   <li><p>In speech media, the user agent should render the <span>nested browsing context</span>
-   without announcing that it is a separate document.</p></li>
-
-   <li>
-
-    <p>User agents should, in general, act as if the <span>active document</span> of the
-    <code>iframe</code>'s <span>nested browsing context</span> was part of the document that the
-    <code>iframe</code> is in, if any.</p>
-
-    <p class="example">For example if the user agent supports listing all the links in a document,
-    links in "seamlessly" nested documents would be included in that list without being
-    significantly distinguished from links in the document itself.</p>
-
-   </li>
-
-   <li><p>The <span>nested browsing context</span>'s <code>Window</code> object's
-   <span>cross-boundary event parent</span> is the <span>browsing context container</span>. <ref spec=DOM></p></li>
-
-  </ul>
-
-  <p>If the attribute is not specified, or if the <span>origin</span> conditions listed above are
-  not met, then the user agent should render the <span>nested browsing context</span> in a manner
-  that is clearly distinguishable as a separate <span>browsing context</span>, and the
-  <span>seamless browsing context flag</span> must be set to false for that <span>browsing
-  context</span>.</p>
-
-  <p class="warning">It is important that user agents recheck the above conditions whenever the
-  <span>active document</span> of the <span>nested browsing context</span> of the
-  <code>iframe</code> changes, such that the <span>seamless browsing context flag</span> gets unset
-  if the <span>nested browsing context</span> is <span data-x="navigate">navigated</span> to another
-  origin.</p>
-
-  </div>
-
-  <p class="note">The attribute can be set or removed dynamically, with the rendering updating in
-  tandem.</p>
-
-  <p class="note">The <code data-x="attr-contenteditable">contenteditable</code> attribute does not
-  propagate into <code data-x="attr-iframe-seamless">seamless</code> <code>iframe</code>s.</p>
-
-
   <hr> <!-- FULLSCREEN -->
 
   <p>The <dfn><code data-x="attr-iframe-allowfullscreen">allowfullscreen</code></dfn> attribute is a
@@ -27102,7 +26930,9 @@ 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>, <dfn><code data-x="dom-iframe-sandbox">sandbox</code></dfn>, and <dfn><code data-x="dom-iframe-seamless">seamless</code></dfn> must <span>reflect</span> the respective
+  <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> 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
@@ -78310,10 +78140,6 @@ dictionary <dfn>DragEventInit</dfn> : <span>MouseEventInit</span> {
   context">child browsing contexts</span> of elements that are in <code>Document</code>s that are
   not themselves <span>fully active</span>.</p>
 
-  <p>A <span>nested browsing context</span> can have a <span>seamless browsing context flag</span>
-  set, if it is embedded through an <code>iframe</code> element with a <code
-  data-x="attr-iframe-seamless">seamless</code> attribute.</p>
-
   <p>A <span>nested browsing context</span> can be put into a <dfn>delaying <code
   data-x="event-load">load</code> events mode</dfn>. This is used when it is <span
   data-x="navigate">navigated</span>, to <span>delay the load event</span> of the <span>browsing
@@ -78593,9 +78419,7 @@ dictionary <dfn>DragEventInit</dfn> : <span>MouseEventInit</span> {
   <p>These values have different meanings based on whether the page is sandboxed or not, as
   summarised in the following (non-normative) table. In this table, "current" means the
   <span>browsing context</span> that the link or script is in, "parent" means the <span>parent
-  browsing context</span> of the one the link or script is in, "master" means the nearest
-  <span>ancestor browsing context</span> of the one the link or script is in that is not itself in a
-  <span data-x="attr-iframe-seamless">seamless iframe</span>, "top" means the <span>top-level
+  browsing context</span> of the one the link or script is in, "top" means the <span>top-level
   browsing context</span> of the one the link or script is in, "new" means a new <span>top-level
   browsing context</span> or <span>auxiliary browsing context</span> is to be created, subject to
   various user preferences and user agent policies, "none" means that nothing will happen, and
@@ -78611,37 +78435,25 @@ dictionary <dfn>DragEventInit</dfn> : <span>MouseEventInit</span> {
      <th rowspan=2>Ordinary effect
      <th colspan=5>Effect in an <code>iframe</code> with...
     <tr>           <!-- nothing -->
-     <th><code data-x="">seamless=""</code>
      <th><code data-x="">sandbox=""</code>
-     <th><code data-x="">sandbox="" seamless=""</code>
      <th><code data-x="">sandbox="allow-top-navigation"</code>
-     <th><code data-x="">sandbox="allow-top-navigation" seamless=""</code>
 
    <tbody>
     <tr>
      <td>none specified, for links and form submissions <!-- same as empty string -->
      <td>current
-     <td>master
      <td>current
-     <td>master
      <td>current
-     <td>master
 
     <tr>
      <td>empty string
      <td>current
-     <td>master
      <td>current
-     <td>master
      <td>current
-     <td>master
 
     <tr>
      <td><code data-x="">_blank</code>
      <td>new
-     <td>new
-     <td>maybe new
-     <td>maybe new
      <td>maybe new
      <td>maybe new
 
@@ -78650,34 +78462,22 @@ dictionary <dfn>DragEventInit</dfn> : <span>MouseEventInit</span> {
      <td>current
      <td>current
      <td>current
-     <td>current
-     <td>current
-     <td>current
 
     <tr>
      <td><code data-x="">_parent</code> if there isn't a parent
      <td>current
      <td>current
      <td>current
-     <td>current
-     <td>current
-     <td>current
 
     <tr>
      <td><code data-x="">_parent</code> if parent is also top
      <td>parent/top
-     <td>parent/top
-     <td>none
      <td>none
      <td>parent/top
-     <td>parent/top
 
     <tr>
      <td><code data-x="">_parent</code> if there is one and it's not top
      <td>parent
-     <td>parent
-     <td>none
-     <td>none
      <td>none
      <td>none
 
@@ -78686,25 +78486,16 @@ dictionary <dfn>DragEventInit</dfn> : <span>MouseEventInit</span> {
      <td>current
      <td>current
      <td>current
-     <td>current
-     <td>current
-     <td>current
 
     <tr>
      <td><code data-x="">_top</code> if top is not current
      <td>top
-     <td>top
-     <td>none
      <td>none
      <td>top
-     <td>top
 
     <tr>
      <td>name that doesn't exist
      <td>new
-     <td>new
-     <td>maybe new
-     <td>maybe new
      <td>maybe new
      <td>maybe new
 
@@ -78713,43 +78504,28 @@ dictionary <dfn>DragEventInit</dfn> : <span>MouseEventInit</span> {
      <td>specified descendant
      <td>specified descendant
      <td>specified descendant
-     <td>specified descendant
-     <td>specified descendant
-     <td>specified descendant
 
     <tr>
      <td>name that exists and is current
      <td>current
      <td>current
      <td>current
-     <td>current
-     <td>current
-     <td>current
 
     <tr>
      <td>name that exists and is an ancestor that is top
      <td>specified ancestor
-     <td>specified ancestor
-     <td>none
      <td>none
      <td>specified ancestor/top
-     <td>specified ancestor/top
 
     <tr>
      <td>name that exists and is an ancestor that is not top
      <td>specified ancestor
-     <td>specified ancestor
-     <td>none
-     <td>none
      <td>none
      <td>none
 
     <tr>
      <td>other name that exists with common top
      <td>specified
-     <td>specified
-     <td>none
-     <td>none
      <td>none
      <td>none
 
@@ -78758,25 +78534,16 @@ dictionary <dfn>DragEventInit</dfn> : <span>MouseEventInit</span> {
      <td>specified
      <td>specified
      <td>specified
-     <td>specified
-     <td>specified
-     <td>specified
 
     <tr>
      <td>name that exists with different top, if <span data-x="familiar with">familiar</span> but not <span>one permitted sandboxed navigator</span>
      <td>specified
-     <td>specified
-     <td>none
-     <td>none
      <td>none
      <td>none
 
     <tr>
      <td>name that exists with different top, not <span data-x="familiar with">familiar</span>
      <td>new
-     <td>new
-     <td>maybe new
-     <td>maybe new
      <td>maybe new
      <td>maybe new
 
@@ -78843,11 +78610,6 @@ dictionary <dfn>DragEventInit</dfn> : <span>MouseEventInit</span> {
     <p>If the given browsing context name is the empty string or <code data-x="">_self</code>, then
     the chosen browsing context must be the current one.</p>
 
-    <p>If the given browsing context name is <code data-x="">_self</code>, then this is an
-    <span>explicit self-navigation override</span>, which overrides the behaviour of the
-    <span>seamless browsing context flag</span> set by the <code
-    data-x="attr-iframe-seamless">seamless</code> attribute on <code>iframe</code> elements.</p>
-
    </li>
 
    <li><p>If the given browsing context name is <code data-x="">_parent</code>, then the chosen
@@ -78870,9 +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>
@@ -80464,23 +80223,6 @@ x === this; // true</pre>
    </dd>
 
 
-   <dt>The <dfn>sandboxed seamless iframes flag</dfn></dt>
-
-   <dd>
-
-    <p>This flag prevents content from using the <code data-x="attr-iframe-seamless">seamless</code>
-    attribute on descendant <code>iframe</code> elements.</p>
-
-    <p class="note">This prevents a page inserted using the <code
-    data-x="attr-iframe-sandbox-allow-same-origin">allow-same-origin</code> keyword from using a
-    CSS-selector-based method of probing the DOM of other pages on the same site (in particular,
-    pages that contain user-sensitive information).</p>
-
-    <!-- https://lists.w3.org/Archives/Public/public-web-security/2009Dec/thread.html#msg51 -->
-
-   </dd>
-
-
    <dt>The <dfn>sandboxed origin browsing context flag</dfn></dt>
 
    <dd>
@@ -80620,8 +80362,6 @@ x === this; // true</pre>
 
      <li><p>The <span>sandboxed plugins browsing context flag</span>.</p></li>
 
-     <li><p>The <span>sandboxed seamless iframes flag</span>.</p></li>
-
      <li>
 
       <p>The <span>sandboxed origin browsing context flag</span>, unless the <var>tokens</var> contains the <dfn><code data-x="attr-iframe-sandbox-allow-same-origin">allow-same-origin</code></dfn>
@@ -82089,14 +81829,6 @@ State: &lt;OUTPUT NAME=I>1&lt;/OUTPUT> &lt;INPUT VALUE="Increment" TYPE=BUTTON O
 
    </li>
 
-   <li id="seamlessLinks"><p>If the <span>source browsing context</span> is the same as the
-   <span>browsing context</span> being navigated, and this browsing context has its <span>seamless
-   browsing context flag</span> set, and the <span>browsing context</span> being navigated was not
-   chosen using an <dfn>explicit self-navigation override</dfn>, then find the nearest
-   <span>ancestor browsing context</span> that does not have its <span>seamless browsing context
-   flag</span> set, and continue these steps as if <em>that</em> <span>browsing context</span> was
-   the one that was going to be <span data-x="navigate">navigated</span> instead.</p></li>
-
    <li><p>If there is a preexisting attempt to navigate the <span>browsing context</span>, and the
    <span>source browsing context</span> is the same as the <span>browsing context</span> being
    navigated, and that attempt is currently running the <span>unload a document</span> algorithm,
@@ -108436,10 +108168,8 @@ html, body { display: block; }</pre>
   <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, if the <code>body</code> element's <span>node document</span>'s
-  <span>browsing context</span> does not have its <span>seamless browsing context flag</span> set, a
-  default value of 8px is expected to be used for that property instead.</p>
-
+  cannot be parsed successfully, then a default value of 8px is expected to be used for that property
+  instead.</p>
   <table>
    <thead>
     <tr>
@@ -109600,8 +109330,7 @@ legend {
 
   <pre class="css">@namespace url(http://www.w3.org/1999/xhtml);
 
-iframe:not([seamless]) { border: 2px inset; }
-iframe[seamless] { display: block; }
+iframe { border: 2px inset; }
 <span id="video-object-fit">video { object-fit: contain; }</span></pre>
 
 
@@ -111842,11 +111571,6 @@ 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
@@ -114038,7 +113762,6 @@ if (s = prompt('What is your name?')) {
          <code data-x="attr-iframe-srcdoc">srcdoc</code>;
          <code data-x="attr-iframe-name">name</code>;
          <code data-x="attr-iframe-sandbox">sandbox</code>;
-         <code data-x="attr-iframe-seamless">seamless</code>;
          <code data-x="attr-iframe-allowfullscreen">allowfullscreen</code>;
          <code data-x="attr-dim-width">width</code>;
          <code data-x="attr-dim-height">height</code></td>
@@ -116195,11 +115918,6 @@ if (s = prompt('What is your name?')) {
      <td> <code data-x="attr-style-scoped">style</code>
      <td> Whether the styles apply to the entire document or just the parent subtree
      <td> <span>Boolean attribute</span>
-    <tr>
-     <th> <code data-x="">seamless</code>
-     <td> <code data-x="attr-iframe-seamless">iframe</code>
-     <td> Whether to apply the document's styles to the nested content
-     <td> <span>Boolean attribute</span>
     <tr>
      <th> <code data-x="">selected</code>
      <td> <code data-x="attr-option-selected">option</code>