Allow script-inserted body to unblock document's rendering

xiaochengh · web-flow · commit de7370b65bd3 · 2022-03-09T11:46:47.000-05:00
Fixes #7689.
diff --git a/source b/source
@@ -9705,20 +9705,16 @@ partial interface <dfn id="document" data-lt="">Document</dfn> {
   <p>Each <code>Document</code> has a <dfn>render-blocking element set</dfn>, a <span>set</span> of
   elements, initially the empty set.</p>
 
-  <p>Each <code>Document</code> has an <dfn>awaiting parser-inserted body flag</dfn>, a boolean,
-  initially true if the document's <span data-x="concept-document-content-type">content type</span>
-  is "<code>text/html</code>"; otherwise false.</p>
-
-  <p class="note" id="await-parser-inserted-body-flag-flip">The flag will be set to false <span
-  data-x="insertion mode: after head"> when the parser inserts a <code>body</code> or a
-  <code>frameset</code> element</span>.</p>
+  <p>A <code>Document</code> <var>document</var> <dfn>allows adding render-blocking elements</dfn>
+  if <var>document</var>'s <span data-x="concept-document-content-type">content type</span> is
+  "<code>text/html</code>" and <span>the body element</span> of <var>document</var> is null.</p>
 
   <p>A <code>Document</code> <var>document</var> is <dfn>render-blocked</dfn> if both of the
   following are true:</p>
 
   <ul>
    <li><p><var>document</var>'s <span>render-blocking element set</span> is non-empty, or
-   <var>document</var>'s <span>awaiting parser-inserted body flag</span> is true.</p>
+   <var>document</var> <span>allows adding render-blocking elements</span>.</p>
 
    <li><p>The <span>current high resolution time</span> given <var>document</var>'s <span>relevant
    global object</span> has not exceeded an <span>implementation-defined</span> timeout value.</p>
@@ -9729,7 +9725,7 @@ partial interface <dfn id="document" data-lt="">Document</dfn> {
   <ol>
    <li><p>Let <var>document</var> be <var>el</var>'s <span>node document</span>.</p>
 
-   <li><p>If <var>document</var>'s <span>awaiting parser-inserted body flag</span> is true, then
+   <li><p>If <var>document</var> <span>allows adding render-blocking elements</span>, then
    <span data-x="set append">append</span> <var>el</var> to <var>document</var>'s
    <span>render-blocking element set</span>.</p>
   </ol>
@@ -112151,8 +112147,6 @@ document.body.appendChild(text);
    <dd>
     <p><span>Insert an HTML element</span> for the token.</p>
 
-    <p>Set the <code>Document</code>'s <span>awaiting parser-inserted body flag</span> to false.</p>
-
     <p>Set the <span>frameset-ok flag</span> to "not ok".</p>
 
     <p>Switch the <span>insertion mode</span> to "<span data-x="insertion mode: in body">in
@@ -112163,13 +112157,6 @@ document.body.appendChild(text);
    <dd>
     <p><span>Insert an HTML element</span> for the token.</p>
 
-    <p>Set the <code>Document</code>'s <span>awaiting parser-inserted body flag</span> to false.</p>
-
-    <p class="note" id="parser-frameset-as-body">The <span>awaiting parser-inserted body flag</span>
-    is exclusively used by <span data-x="render-blocking mechanism">render-blocking</span>, for
-    which the presence of either a <code>frameset</code> or a <code>body</code> element indicates
-    that there is content to render, so we simply treat them as the same.</p>
-
     <p>Switch the <span>insertion mode</span> to "<span data-x="insertion mode: in frameset">in
     frameset</span>".</p>
    </dd>
@@ -112215,8 +112202,6 @@ document.body.appendChild(text);
     <!-- fake <body>, but without resetting frameset-ok -->
     <p><span>Insert an HTML element</span> for a "body" start tag token with no attributes.</p>
 
-    <p>Set the <code>Document</code>'s <span>awaiting parser-inserted body flag</span> to false.</p>
-
     <p>Switch the <span>insertion mode</span> to "<span data-x="insertion mode: in body">in
     body</span>".</p>
     <!-- end fake <body> -->
